body {
    margin: auto;
}

#header{
    /* background-color: aquamarine; */
    /* height: 20px; */
    padding: 1%;
}

#head_content {
    /* background-color: red; */
    overflow: auto;
    color: black;
    font-size: 30px;
    font-weight: bold;
    
}

.right {
    /* float: right;
    margin-right: 3%;
    padding: 1%;
    font-size: 15px; */
    /* background-color: green; */
}
.right a {
    text-decoration: none;
    /* border-style: solid; */

    float: right;
    margin-right: 3%;
    padding: 1%;
    font-size: 15px;
}
.left {
    /* background-color: green; */
    float: left;
    margin-left: 5%;
    padding: 1%;
    margin-top: 2px;
    
}

.left a {
    text-decoration: none;
    color: black;
}

#note {
    text-align: center;
    margin-top: 30px;
    margin-bottom: 70px;
}

#banner{
    background-image: url(../img/banner1.jpg);
    background-repeat: no-repeat;
    background-color: bisque;
    background-size: 100% 100%;
    height: 400px
}

#start {
    font-size: 15px;
    padding: 10px;
}

#key_note {
    font-size: 40px;
    font-weight: bold;
}
#status{
    
    height: 230px;
    /* background-color: red; */
}
.status_box{
    /* background-color: blueviolet; */
    height: 100%;
    width: 29%;
    float: left;
    margin-left: 3%;
    border-radius: 3%;
    border-style: solid;
    border-color: lightgrey;
    border-width: 1px;

    text-align: center;
    

    
    
    
}

.status_content {
    line-height: 30px;
    padding: 25px;
    font-weight: bold;
}

.title {
    font-size: 25px;
    font-family: 'monospace';
}

#level2 {
    margin-top: 50px;
    padding-top: 30px;
    background-color: rgb(221, 230, 240);
}

#popular{
    margin-top: 30px;
    /* margin-bottom: 70px; */
    margin-bottom: 2%;
    text-align: center;

    
}

#popular_title {
    font-size: 40px;
    font-weight: bold;
}

.popular_content{
    font-size: 15px;
    padding: 5px;
}
#courses{
    
    
    /* height: 180px; */
    /* background-color: red; */
    /* margin: auto; */
    padding-left: 2%;
    overflow: auto;
}
.courses_box{
    height: 100%;
    width: 21%;
    float: left;
    margin-left: 3%;
    border-radius: 5%;
    background-color: white;
    /* border-style: solid; */
    /* border-width: 1px; */
    /* box-shadow: 1px 1px; */

    margin-top: 3%;
    
}
#icon_div {
    /* border-style: solid;  */
    /* background-color: antiquewhite; */
    width: 20%;
    position: relative;
    top: 12px;
    left: 5%;
}
.course_content {
    padding: 10px 20px;
}

.course_content p {
    line-height: 25px;
}

#more_course{
    text-align: center;
    /* clear: both; */
    padding-top: 100px;
    padding-bottom: 3%;
}

#more_course span{
    /* border-style: solid; */
    padding: 8px 25px;
    color: white;
    background-color: rgb(15, 102, 220);
}

#footer {
    padding-top: 7%;
    padding-bottom: 7%;
    /* border-style: solid; */
    overflow: auto;
    background-color: black;
    color: white;
}

.summary {
    height: 200px;
    /* border-style: solid; */
    float: left;
    margin-left: 10%;
    width: 20%;
}

.qling {
    margin-top: 10px;
    display: block;
    color: white;
    text-decoration: none;
}