#openbook-html .page-html @media speech{
 .digits {-epub-speak-as: digits}

#openbook-html .page-html .spell{-epub-speak-as: spell-out}

}

#openbook-html .page-html body{
text-align: left;
}

#openbook-html .page-html a{
text-decoration: underline;
overflow-wrap: anywhere;
}

#openbook-html .page-html aside.left,
#openbook-html .page-html div.left,
#openbook-html .page-html aside{
display: block;
margin: 1.0em 0em 1.0em 1.0em;
text-indent: 0em;
}

#openbook-html .page-html figure{
display: block;
margin: 2.0em 0em;
page-break-inside: avoid;
}

#openbook-html .page-html figure.fig{
margin-bottom: 0em !important;
}

#openbook-html .page-html img{
width: auto; height: auto; margin-left: auto !important; margin-right: auto !important;
}

#openbook-html .page-html /* Box Footnote */
.bfn{
display: block;
margin: 0em 0em;
text-indent: 1.0em;
font-size: 0.90em;
}

#openbook-html .page-html .bfn1{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 0.90em;
}

#openbook-html .page-html .bfn1-1{
display: block;
margin: 1.0em 0em 0em;
text-indent: 0em;
font-size: 0.90em;
}

#openbook-html .page-html /* For Background Color */
.bg{background-color: #E7E7E8;}

#openbook-html .page-html /* For Text Color */
.tc{color: #F86C07 !important;}

#openbook-html .page-html span.big{
font-size: 1.80em;
}

#openbook-html .page-html div.bibliography{
margin-top:0.5%;
}

#openbook-html .page-html /* For Blockqoute */
div.bkt{
display: block;
margin: 1.0em 2.0em 1.0em 1.0em;
}

#openbook-html .page-html /* For specific element bold */
.bold{
font-weight: bold !important;
}

#openbook-html .page-html /* Margin bottom/top with any element */
.bot{margin-bottom: 1.0em !important;}

#openbook-html .page-html .top{margin-top: 1.0em !important;}

#openbook-html .page-html /* Box with gray background */
.box{
display: block;
margin: 2.50em 30%;
border: solid 1pt #00618C;
padding: 1.0em 1.0em;
}

#openbook-html .page-html /* For Page Break */
.break{
page-break-before: always;
}

#openbook-html .page-html /* For Box Heading */
.bxt{
display: block;
text-align: center !important;
margin: 0em 0em 0.75em 0em;
font-size: 1.20em !important;
font-weight: bold !important;
font-style: normal !important;
}

#openbook-html .page-html .bxt-1{
display: block;
text-align: left !important;
margin: 1.0em 0em 0em;
text-indent: 0em;
font-size: 1.10em;
font-weight: bold !important;
font-style: normal !important;
}

#openbook-html .page-html /* For image caption */
.cap{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 0.90em;
padding-top: 0.50em;
page-break-before: avoid;
}

#openbook-html .page-html .cite{
display: block;
margin: 1.0em 0em 2.0em;
text-indent: 0em;
font-size: 0.90em;
page-break-before: avoid;
}

#openbook-html .page-html /* For Cover or Title Image or Half Title Pages */
body.fullpage{
   margin: 0;
   padding: 0;
}

#openbook-html .page-html section.cover{
   display: block;
   text-align: center;
   height: 95%;
}

#openbook-html .page-html img#coverimage{
   height: 95%;
}

#openbook-html .page-html /*overrides the previous setting,
#openbook-html .page-html but only in newer systems that support CSS3 */
img#coverimage:only-of-type{ 
   height: 95vh;
}

#openbook-html .page-html /* Copyright Text */
.crt{
display: block;
margin: 1.0em 0em 0em 0em;
text-indent: 0em;
font-size: 0.90em;
text-align: left;
}

#openbook-html .page-html .crth{
display:block;
margin: 0em 0em 0em 1.0em;
text-indent: -1.0em;
font-size: 0.90em;
text-align: left;
}

#openbook-html .page-html .ded{
display: block;
margin: 4.0em 0em 0em 0em;
font-size: 1.0em;
text-indent: 0em;
text-align: center;
}

#openbook-html .page-html .dropcap{
float: left;
line-height: 0.65em;
font-size: 3.0em;
margin: 0.1em 0.1em 0.2em 0;
}

#openbook-html .page-html /* For Equation */
p.equ{
display: block;
margin: 1.50em 0em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
}

#openbook-html .page-html p.equ-1{
display: block;
margin: 0em 0em 1.50em;
text-indent: 0em;
font-size: 1.0em;
text-align: right;
}

#openbook-html .page-html div.equ-2{
display: block;
margin: 1.50em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
}

#openbook-html .page-html /* For Blockqoute paragraph */
.ext{
display: block;
margin: 0em 0em;
text-indent: 1.0em;
font-size: 0.90em;
}

#openbook-html .page-html .ext1{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 0.90em;
}

#openbook-html .page-html .ext1-1{
display: block;
margin: 1.0em 0em 0em;
text-indent: 0em;
font-size: 0.90em;
}

#openbook-html .page-html .extr{
display: block;
margin: 1.0em 0em 0em;
text-indent: 0em;
font-size: 0.90em;
text-align: right;
}

#openbook-html .page-html /* For Footnote */
.fn1{
display: block;
margin: 0em 0em;
text-indent: 1.0em;
font-size: 0.90em;
}

#openbook-html .page-html .fn{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 0.90em;
}

#openbook-html .page-html section.footnote,
#openbook-html .page-html div.footnote{
margin-top:0.5%;
}

#openbook-html .page-html /* For headings H1-H6 */
h1{
display: block;
margin: 1.0em 0em 0em;
font-weight: bold;
text-indent: 0em;
font-size: 2.50em;
}

#openbook-html .page-html h2{
display: block;
margin: 2.0em 2.0em 4.0em;
text-indent: 0em;
font-size: 2.0em;
font-weight: bold;
text-align: center;
}

#openbook-html .page-html h2.fm{
display: block;
margin: 2.0em 2.0em 1.50em;
font-size: 1.10em;
font-weight: bold;
}

#openbook-html .page-html h3{
display: block;
margin: 1.50em 0em 0.75em;
text-indent: 0em;
font-size: 1.20em;
font-weight: bold;
text-align: center;
}

#openbook-html .page-html h3.fm{
font-size: 1.10em;
font-style: italic;
text-align: left !important;
font-weight: normal !important;
}

#openbook-html .page-html h4{
display: block;
margin: 1.50em 0em 0.75em;
text-indent: 0em;
font-size: 1.10em;
font-weight: bold;
text-align: center;
}

#openbook-html .page-html h4.left{
font-weight: normal !important;
font-style: italic !important;
text-align: left !important;
}

#openbook-html .page-html h5{
display: block;
margin: 1.50em 0em 0.75em;
text-indent: 0em;
font-size: 1.10em;
font-weight: normal;
font-style: italic;
text-align: left;
}

#openbook-html .page-html .h44{
display: block;
margin: 4.0em 0em 0em;
text-indent: 0em;
font-size: 2.0em;
text-align: center;
}

#openbook-html .page-html h6{
display: block;
margin: 1.50em 0em 0em;
text-indent: 0em;
font-size: 1.10em;
font-weight: bold;
text-align: left;
}

#openbook-html .page-html /* For hanging */
.hang{
display:block;
margin: 0em 0em 0em 1.0em;
text-indent: -1.0em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .hang-1{
display:block;
margin: 1.0em 0em 0em 1.0em;
text-indent: -1.0em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html /* For Indenx */
.ind{
display: block;
margin: 0em 0em 0em 1.0em;
text-indent: -1.0em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .inline{
display: inline;
vertical-align: middle;
}

#openbook-html .page-html .baseline{
display: inline;
vertical-align: baseline;
}

#openbook-html .page-html h5.inline{
display: inline !important;
text-align: left !important;
font-size: 1.0em !important;
}

#openbook-html .page-html p.inline{
display: inline !important;
font-size: 1.0em !important;
padding-left: 0.50em; 
}

#openbook-html .page-html .nb{font-weight: normal !important;}

#openbook-html .page-html .ni{font-style: normal !important;}

#openbook-html .page-html /* For Part */
.part{
display:block;
margin: 4.0em 0em 2.0em;
text-indent: 0em;
font-size: 2.0em;
text-align: center;
}

#openbook-html .page-html /* For Refrence */
.ref{
display:block;
margin: 0em 0em 0em 1.0em;
text-indent: -1.0em;
font-size: 1.0em;
}

#openbook-html .page-html .ref1{
display:block;
margin: 0em 0em 0em 1.0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html /* For image */
.ser{
display:block;
margin: 1.50em 0em;
text-indent: 0em;
text-align: center;
}

#openbook-html .page-html .ser-1{
display:block;
text-indent: 0em;
margin: 1.50em 0em 0em 0em;
text-align: center;
}

#openbook-html .page-html .ser0{
display:block;
margin: 2.50em 0em 0.50em 0em;
text-indent: 0em;
text-align: center;
}

#openbook-html .page-html .ser2{
margin: 0em 0em 2.0em;
text-indent: 0em;
padding: 0.5em 0em;
page-break-inside: avoid;
}

#openbook-html .page-html span.spa{
display: inline-block;
white-space: pre-wrap;
text-indent: 0em;
width: 1.50em;
}

#openbook-html .page-html span.spa1{
display: inline-block;
white-space: pre-wrap;
text-indent: 0em;
width: 3.0em;
}

#openbook-html .page-html span.strike{
text-decoration: line-through;
}

#openbook-html .page-html sup.sup{
margin-left: -0.70em;
}

#openbook-html .page-html /* Box Miscellaneous */
aside.tb0,
#openbook-html .page-html ol.tb0,
#openbook-html .page-html ul.tb0{
margin-top: 0em !important;
margin-bottom: 0em !important;
}

#openbook-html .page-html .left{text-align: left !important;}

#openbook-html .page-html .right{text-align: right !important;}

#openbook-html .page-html /* For Table Title */
.tab{
display: block;
margin: 2.0em 0em 0.20em;
text-indent: 0em;
font-size: 1.0em;
page-break-after: avoid;
}

#openbook-html .page-html .tab0{
display: block;
margin: 0em 0em 0.20em;
text-indent: 0em;
font-size: 1.0em;
page-break-after: avoid;
}

#openbook-html .page-html /* For Table Footnote */
.tfn{
display: block;
margin: 0em 0em;
text-indent: 1.0em;
font-size: 0.90em;
page-break-before: avoid;
}

#openbook-html .page-html .tfn1{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 0.90em;
page-break-before: avoid;
}

#openbook-html .page-html .tfn2{
display: block;
margin: 0em 0em 2.50em;
text-indent: 0em;
font-size: 0.90em;
page-break-before: avoid;
}

#openbook-html .page-html .tfn3{
display: block;
margin: 0em 0em 2.50em;
text-indent: 1.0em;
font-size: 0.90em;
page-break-before: avoid;
}

#openbook-html .page-html /* For Title Page */
.title{
display: block;
margin: 0.30em 0em;
text-indent: 0em;
font-size: 2.50em;
}

#openbook-html .page-html .title-1{
display: block;
margin: 1.0em 0em 2.0em;
text-indent: 0em;
font-size: 1.50em;
}

#openbook-html .page-html .title-2{
display: block;
margin: 1.0em 0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html .title-3{
display: block;
margin: 4.0em 0em 0em 0em;
padding: 0.50em 2.0em 0em;
text-indent: 0em;
font-size: 1.50em;
text-align: right;
font-weight: bold;
border-top: 1pt solid #000000;
}

#openbook-html .page-html .title-3b{
display: block;
margin: 5.0em 0em 0.50em 30%;
text-indent: 0em;
font-size: 1.30em;
font-weight: bold;
background-color: #F7F6F6;
padding: 1.50em;
}

#openbook-html .page-html /* Contents Page Style */
.toc{
display: block;
margin: 1.0em 0em 0em 1.25em;
text-indent: -0.75em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc-1{
display: block;
margin: 0em 0em 0em 2.75em;
text-indent: -1.50em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc-2{
display: block;
margin: 0em 0em 0em 4.25em;
text-indent: -1.50em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc-4{
display: block;
margin: 0em 0em 0em 3.25em;
text-indent: -3.25em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc-5{
display: block;
margin: 1.0em 0em 0em 3.25em;
text-indent: -3.25em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc0{
display: block;
margin: 0em 0em 0em 1.50em;
text-indent: -1.0em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html .toc1{
display: block;
margin: 1.0em 0em 0em 1.25em;
text-indent: -1.25em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html /* Paragraph with Indent */
.tx{
display: block;
margin: 0em 0em;
text-indent: 1.0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx-1{
display: block;
margin: 1.0em 0em 0em;
text-indent: 1.0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx-2{
display: block;
margin: 2.50em 0em 0em;
text-indent: 1.0em;
font-size: 1.0em;
}

#openbook-html .page-html /* Paragraph with Nonindent */
.tx1{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx1-1{
display: block;
margin: 1.0em 0em 0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx1-2{
display: block;
margin: 2.50em 0em 0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html /* Other Paragraph */
.tx2{
display: block;
margin: 1.0em 0em 1.0em 1.0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx3{
display: block;
margin: 1.0em 0em 0em 1.0em;
text-indent: 0em;
font-size: 1.0em;
}

#openbook-html .page-html .tx4{
display: block;
margin: 1.0em 0em 0em 50%;
text-indent: 0em;
font-size: 1.0em;
text-align: left;
}

#openbook-html .page-html /* center paragraph */
.txc{
display: block;
margin: 1.0em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
}

#openbook-html .page-html .txca{
display: block;
margin: 1.0em 0em 4.0em;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
}

#openbook-html .page-html .txcb{
display: block;
margin: 1.0em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
background-color: #E9E8E7;
padding: 0.50em;
}

#openbook-html .page-html /* paragraph with right */
.txr{
display: block;
margin: 0em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: right;
}

#openbook-html .page-html .txr-1{
display: block;
margin: 1.0em 0em 0em 0em;
text-indent: 0em;
font-size: 1.0em;
text-align: right;
}

#openbook-html .page-html .txrc{
display: block;
margin: 0em 0em 0em 25%;
text-indent: 0em;
font-size: 1.0em;
text-align: center;
}

#openbook-html .page-html span.underline{
text-decoration: underline;
}

#openbook-html .page-html span.overline{
text-decoration: overline;
}

#openbook-html .page-html /* Use for breaking in the middle of words */
a.word-break{
text-decoration: none;
word-break: break-all;
}

#openbook-html .page-html /* Order List */
ol{
display: block;
margin: 1.0em 0em;
padding: 0em 0em 0em 2.50em;
}

#openbook-html .page-html ol li ul{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.0em;
list-style-type: disc;
}

#openbook-html .page-html ol.italic{
font-style: italic !important;
}

#openbook-html .page-html ol.lower-latin{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.25em;
list-style-type: lower-alpha;
}

#openbook-html .page-html ol.lower-roman{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.25em;
list-style-type: lower-roman;
}

#openbook-html .page-html ol.ol0{
display: block;
margin: 1.0em 0em;
padding: 0em 0em 0em 1.0em;
}

#openbook-html .page-html ol.upper-latin{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.25em;
list-style-type: upper-alpha;
}

#openbook-html .page-html ol.upper-roman{
display: block;
margin: 1.0em 0em;
padding: 0em 0em 0em 2.25em;
list-style-type: upper-roman;
}

#openbook-html .page-html /* Unorder List */
ul{
display: block;
margin: 1.0em 0em;
padding: 0em 0em 0em 2.15em;
}

#openbook-html .page-html ul li ul{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.15em;
list-style-type: circle;
}

#openbook-html .page-html ul.circle{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.0em;
list-style-type: circle;
}

#openbook-html .page-html ul.disc{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.15em;
list-style-type: disc;
}

#openbook-html .page-html ul.square{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 1.15em;
list-style-type: square;
}

#openbook-html .page-html ul.ul0{
display: block;
margin: 1.0em 0em;
padding: 0em 0em 0em 1.0em;
}

#openbook-html .page-html ul.ul2{
display: block;
margin: 0em 0em;
padding: 0em 0em 0em 3.0em;
}

#openbook-html .page-html li{
margin: 0em 0em 0em 0em;
font-size: 1.0em;
}

#openbook-html .page-html ul.li-1 li,
#openbook-html .page-html ol.li-1 li{
margin: 1.0em 0em;
font-size: 1.0em;
}

#openbook-html .page-html li.li-1{
margin: 1.0em 0em 0em 0em;
font-size: 1.0em;
}

#openbook-html .page-html li.none{
list-style-type: none;
}

#openbook-html .page-html span.sm,
#openbook-html .page-html ul.sm,
#openbook-html .page-html ol.sm{
font-size: 0.90em !important;
}

#openbook-html .page-html /* Table without Border */
table{
border-collapse: collapse;
overflow-wrap: anywhere;
font-size: 1.0em;
margin: 0.20em 0.20em;
text-align: left;
}

#openbook-html .page-html table td{
padding: 0.10em 0.30em 0.10em 0.20em;
vertical-align: top;
}

#openbook-html .page-html table th{
border-top: solid 1pt #000000;
border-bottom: solid 1pt #000000;
padding: 0.10em 0.30em 0.10em 0.20em;
vertical-align: bottom;
font-weight: normal;
text-align: left;
}

#openbook-html .page-html table.table tr.outline{
padding: 0.10em 0.20em;
outline: 1pt solid #000000;
}

#openbook-html .page-html table.table0{
border-collapse: collapse;
overflow-wrap: anywhere;
font-size: 1.0em;
margin: 0em 0em;
}

#openbook-html .page-html table.table0 td{
padding: 0em 0.50em 0em 0em;
vertical-align: top;
}

#openbook-html .page-html /* Table for Equation */
table.equ{
border-collapse: collapse;
font-size: 1.0em;
margin: 1.50em 0em 1.0em;
}

#openbook-html .page-html table.equ td{
padding: 0em 0.50em 0em 0em;
vertical-align: bottom;
}

#openbook-html .page-html /* Table with Border */
table.table-border{
border-collapse: collapse;
overflow-wrap: anywhere;
font-size: 1.0em;
margin: 0.20em 0em;
}

#openbook-html .page-html table.table-border th{
border: 1pt solid #000000;
padding: 0.20em 0.50em 0.20em 0.20em;
vertical-align: bottom;
font-weight: normal;
text-align: left;
}

#openbook-html .page-html table.table-border td{
border: 1pt solid #000000;
padding: 0.20em 0.50em 0.20em 0.20em;
vertical-align: top;
}

#openbook-html .page-html table.table-midd{
border-collapse: collapse;
overflow-wrap: anywhere;
font-size: 1.0em;
margin: 0.20em 0em;
}

#openbook-html .page-html table.table-midd th{
border: 1pt solid #000000;
padding: 0.20em 0.50em 0.20em 0.20em;
vertical-align: middle;
font-weight: normal;
}

#openbook-html .page-html table.table-midd td{
border: 1pt solid #000000;
padding: 0.20em 0.50em 0.20em 0.20em;
vertical-align: middle;
}

#openbook-html .page-html table.table-border td.hide{
border-bottom: hidden;
background-color: inherit !important;
}

#openbook-html .page-html table td.right{border-right: 1pt solid #000000;}

#openbook-html .page-html table td.tdb,
#openbook-html .page-html table.table0 td.tdb,
#openbook-html .page-html table.table-border td.tdb,
#openbook-html .page-html table.table-midd td.tdb{
vertical-align: bottom !important;
}

#openbook-html .page-html table td.tdc,
#openbook-html .page-html table th.thc,
#openbook-html .page-html table.table0 td.tdc,
#openbook-html .page-html table.equ td.tdc,
#openbook-html .page-html table.table-border td.tdc,
#openbook-html .page-html table.table-border th.thc,
#openbook-html .page-html table.table-midd td.tdc,
#openbook-html .page-html table.table-midd th.thc{
text-align: center !important;
}

#openbook-html .page-html table td.tdl,
#openbook-html .page-html table.table0 td.tdl,
#openbook-html .page-html table.table-border td.tdl{
padding-left: 1.0em !important;
}

#openbook-html .page-html table td.tdcm,
#openbook-html .page-html table th.thcm,
#openbook-html .page-html table.table0 td.tdcm,
#openbook-html .page-html table.table-border td.tdcm,
#openbook-html .page-html table.table-border th.thcm,
#openbook-html .page-html table.table-midd td.tdcm,
#openbook-html .page-html table.table-midd th.thcm{
text-align: center !important;
vertical-align: middle !important;
}

#openbook-html .page-html table td.tdm,
#openbook-html .page-html table th.thm,
#openbook-html .page-html table.table0 td.tdm,
#openbook-html .page-html table.table-border td.tdm,
#openbook-html .page-html table.table-border th.thm,
#openbook-html .page-html table.table-midd td.tdm,
#openbook-html .page-html table.table-midd th.thm{
vertical-align: middle !important;
}

#openbook-html .page-html table td.tdr,
#openbook-html .page-html table th.thr,
#openbook-html .page-html table.equ td.tdr,
#openbook-html .page-html table.table0 td.tdr,
#openbook-html .page-html table.table-border th.thr,
#openbook-html .page-html table.table-border td.tdr,
#openbook-html .page-html table.table-midd th.thr,
#openbook-html .page-html table.table-midd td.tdr{
text-align: right !important;
}

#openbook-html .page-html table td.tdt,
#openbook-html .page-html table.table0 td.tdt{
padding-top: 1.0em !important;
}

#openbook-html .page-html /* Include border in TD a Table */
table td.tb{
border-top: 1pt solid #000000;
}

#openbook-html .page-html table td.tb2{
border-top: 1pt solid #000000;
border-bottom: 1pt solid #000000;
}

#openbook-html .page-html table td.bb{
border-bottom: 1pt solid #000000;
}

#openbook-html .page-html .bb{
padding-bottom: 0.20em !important;
border-bottom: 1pt solid #000000;
}

#openbook-html .page-html table td.bbc{
border-bottom: 1pt solid #00C0EF;
}

#openbook-html .page-html /* For Horizontal Line */
hr{
display: block;
margin-top: 1.50em;
margin-bottom: 1.50em;
margin-left: auto;
margin-right: auto;
border-style: inset;
border-width: 1px;
}