Changing WordPress Nav Font Size

I can’t seem to increase the font size

#siteHeader .customSelectInner {
width: 100%;
text-align: center;
display: block;
}
#siteHeader .customSelect {
border-bottom: 1px solid #ccc;
}
#headerMenu {
text-align: center;
background: #fff;
-webkit-box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
-khtml-box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
-moz-box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
-ms-box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
-o-box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.3), 1px 1px 11px 0px rgba(88,88,88,0.1) inset;
}
#headerMenu ul {
margin: 0px;
}
#headerMenu .customSelect {
text-align: center;
}
#headerMenu .current_page_item > a,
#headerMenu .current_page_parent > a,
#headerMenu .current_page_ancestor > a,
#headerMenu .current-menu-item > a,
#headerMenu .current-menu-ancestor > a,
#headerMenu .current-menu-parent > a {
font-weight: 700;
}
#headerMenu > div > ul {
border-bottom: 1px solid #fff;
max-width: 1140px;
margin: 0 auto;
}
#headerMenu > div > ul > li {
display: inline-block;
*display: inline;
}
#headerMenu > div > ul > li > a {
padding: 22px 17px;
display: inline-block;
*display: inline;
}
#headerMenu > div > ul > li .arrow {
width: 14px;
height: 9px;
display: inline-block;
margin-left: -7px;
background: url(‘images/menu-arrow.png’);
position: absolute;
bottom: -7px;
z-index: 9000;
}
#headerMenu > div > ul > li:hover .sub-container {
display: block;
}
#headerMenu > div > ul > li > .sub-container {
display: none;
z-index: 2000;
background: #f5f5f5;
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top, #f5f5f5 0%, #f9f9f9 4%, #f9f9f9 96%, #f5f5f5 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #f5f5f5), color-stop(4%, #f9f9f9), color-stop(96%, #f9f9f9), color-stop(100%, #f5f5f5));
background: -webkit-linear-gradient(top, #f5f5f5 0%, #f9f9f9 4%, #f9f9f9 96%, #f5f5f5 100%);
background: -o-linear-gradient(top, #f5f5f5 0%, #f9f9f9 4%, #f9f9f9 96%, #f5f5f5 100%);
background: -ms-linear-gradient(top, #f5f5f5 0%, #f9f9f9 4%, #f9f9f9 96%, #f5f5f5 100%);
background: linear-gradient(to bottom, #f5f5f5 0%, #f9f9f9 4%, #f9f9f9 96%, #f5f5f5 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=’#f5f5f5′, endColorstr=’#f5f5f5′, GradientType=0);
border-bottom: 1px solid #fff;
-webkit-box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
-khtml-box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
-moz-box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
-ms-box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
-o-box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
box-shadow: 1px 0px 1px 0px rgba(0, 0, 0, 0.3);
position: absolute;
top: 111px;
left: 0px;
width: 100%;
}
#headerMenu > div > ul > li > .sub-container .arrow-container {
display: none;
}
#headerMenu > div > ul > li > .sub-container > ul {
line-height: 32px;
max-width: 1140px;
margin: 0 auto;
padding: 11px 0;
}
#headerMenu > div > ul > li > .sub-container > ul > li {
display: inline;
padding: 0 22px;
position: relative;
}
#headerMenu > div > ul > li > .sub-container > ul > li:hover ul {
display: block;
}
#headerMenu > div > ul > li > .sub-container > ul ul {
display: none;
position: absolute;
background: #f9f9f9;
top: 16px;
padding: 22px;
white-space: nowrap;
text-align: left;
list-style-type: none;
}
#headerMenu > div > ul > li > .sub-container > ul ul a {
font-size: 0.9em;