.side_bar_outer {
    margin-top: 20px;
}
.side_bar_outer .outline {
    color: #000000;
}
.side_bar_outer ul {
    padding: 0;
    margin: 0;
}
.side_bar_outer li {
    list-style-type:none;
    display: inline-block;
}
.side_bar_outer a {
    display: inline-block;
}
.side_bar_outer .outer_link {
    color: #000000;
    font-size: 23px;
    border-bottom: 2px solid #000000;
    font-weight: bold;
}
.side_bar_outer .img_container {
    display: inline-block;
    height: 50px;
    width: 50px;
    background-repeat: no-repeat;
    margin: 11px;
    background-size: contain;
}
.side_bar_outer .ext_link_item:hover {
    opacity: 0.5;
    transition: opacity 0.15s ease-in-out;
}
.img_ndhu {
    background-image: url('/ezfiles/36/1036/img/3204/ndhu.png');
}
.img_im {
    background-image: url('/ezfiles/36/1036/img/3204/NDHU_IM.png')
}
.img_erp {
    background-image: url('/ezfiles/36/1036/img/3204/ERP.png')
}
.img_facebook {
    background-image: url('/ezfiles/36/1036/img/3204/facebook.png')
}
.img_newStu {
    background-image: url('/ezfiles/36/1036/img/3204/NEWSTUDENT.png')
}
.img_elearn {
    background-image: url('/ezfiles/36/1036/img/3204/elearnig.png')
}
.img_library {
    background-image: url('/ezfiles/36/1036/img/3204/LIBRARY.png')
}