.answer {
    height: 40px;
}

#main-container {
    background-color: white;
}

/* iframe*/
#courseContent {
    width: 100%;
    height: auto;
    /* background-color: rgba(255, 255, 255, .88); */
}

/* iframe video or geogebra*/
.course-plugin {
    width: 100%;
    height: 60vw;
}

.list-group.list-group-root {
    padding: 0;
    overflow: hidden;
}

.list-group.list-group-root .list-group {
    margin-bottom: 0;
}

.list-group.list-group-root .list-group-item {
    border-radius: 0;
    border-width: 1px 0 0 0;
}

.list-group.list-group-root > .list-group-item:first-child {
    border-top-width: 0;
}

.list-group.list-group-root > .list-group-item {
    padding-left: 30px;
}

.list-group.list-group-root > .list-group > .list-group-item {
    padding-left: 60px;
}

.list-group-item .glyphicon {
    margin-right: 5px;
}


.main-body {
    /* background-color: #DEDEBE; */
    background: url('/20221206070901oe_/https://www.math.cuhk.edu.hk/~math1510/assets/assets/math-bg.png') fixed;
}

/* Header Image Background - Change the URL below to your image path (example: ../images/background.jpg) */

.banner {

    width: 1280px;
    height: 384px;
    background: url('/20221206070901oe_/https://www.math.cuhk.edu.hk/~math1510/assets/assets/cuhk1.jpg') center center no-repeat scroll;  
}

/* Customize the text color and shadow color and to optimize text legibility. */


.container-courses {
    background-color: rgba(255, 255, 255, .8);
    width:1280px;
}

.h1-math{
    font-family: "Source Sans Pro","Helvetica Neue",Helvetica,Arial,"Microsoft JhengHei","Apple LiGothic Medium","LiHei Pro Medium",sans-serif;
    font-weight: 500;
    line-height: 1.1;
    color: #242B88;
    text-align: center;
}

.entry-test-question{
    font-family: "Source Sans Pro","Helvetica Neue",Helvetica,Arial,"Microsoft JhengHei","Apple LiGothic Medium","LiHei Pro Medium",sans-serif;
    font-weight: 500;
    line-height: 1.1;
    color: #242B88;
}

.tagline {
    text-shadow: 0 0 10px #000;
    color: #000;
}

.img-center {
    margin: 0 auto;
}

footer {
    margin: 50px 0;
}