*{
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
}

li{
    list-style: none;
}

.w{
    width: 1200px;
    margin: 0 auto;
}

/* 头部样式 */

.title-bg{
    height: 105px;
    background-color: #413e97;
}

.title{
    height: 100%;
    background: url(new_image/title_background.png) no-repeat center;

}
.pku-logo{
    float: right;
    margin:1px 15px;
}

.pku-logo img{
    height: 103px;
}

.web-link{
    float: right;
}

.web-link a{
    padding: 0px 15px;
    font-size: 25px;
    line-height: 105px;
    color: white;
    font-weight: 400;
    border-right: 3px white solid;
}

.web-link a:hover{
    color: black;
    text-decoration: underline solid black;
}

/* 头部样式结束 */
/* 导航栏样式 */
.nav{
    margin-top: 20px;
    height: 40px;
    border-bottom: 2px solid #ccc;
}

.nav li {
    float: left;
    padding: 0  20px 5px 20px;
    border-right: 2px solid #ccc;
}

.nav li span
 {
    font-family: 'icomoon';
    font-size: 25px;
    color: #666;

}

.nav li a{
    font-size: 22px;
    color: #666;

}

.nav li:hover{
    border-bottom: #1a6adc 3px solid;
}

.nav li:hover a,
.nav li:hover span{
    color: #1a6adc;
}


.nav .current-page a,
.nav .current-page span {
    color: orangered;
}

/* 导航栏样式结束 */

/* 内容样式 */
.content-box{
    margin-top: 30px;
    /* height: 700px; */
    /* background-color:pink; */
}

.content-box li{
    padding: 10px 20px;
    margin: 0px 20px;
    /* font-family: 'Arial', '微软雅黑'; */
    font-size: 20px;
    border-bottom: 1px dotted #666;
}

.content-box ul{
    margin-bottom: 30px;
}

.course-info{
    padding-left: 40px;
    text-indent: 2em;
    font-size: 22px;
    margin-bottom: 30px;
}


.content-box h2{
    width: 300px;
    margin-bottom: 30px;
    padding-left: 10px;
    font-size: 25px;
    color: #1a6adc;
    border-bottom: #1a6adc 3px solid;
}


.content-box h3{
    width: 120px;
    height: 40px;
    border-radius: 20px;
    margin-left: 10px;
    margin-bottom: 20px;
    text-align: center;
    line-height: 40px;
    font-size: 24px;
    font-weight: 500;
    /* background: rgba(162, 161, 235, 0.411) ; */
    background: #1a6adc ;
    color: white;
}





/* 底部样式 */
.footer-bg{
    margin-top: 50px;
    height: 180px;
    background-color: #413e97;
}

.footer{
    padding-top: 25px;
    padding-left: 10px;

}

.footer .left-logo{
    float: left;
    padding-right: 50px;
    border-right: #fff 2px solid;

}

.left-logo div{
    float: left;
    height: 100px;
}

.footer .ime-logo{
    padding-top: 25px;
    padding-left: 40px;
}

.footer .middle-link{
    float: left;
    padding-left: 50px;
}

.middle-link dl{
    width: 400px;
    overflow: hidden;
}

.middle-link dd{
    width: 190px;
    float: left;
}



.footer .middle-link dt{
    font-size: 22px;
    color: #fff;
    margin-bottom: 10px;
   }
.footer .middle-link a{
    font-size: 18px;
    color: #ccc;
    line-height: 25px;
}

.footer .right-info{
    float: left;
    padding: 20px 0px 17px 55px;
    font-size: 20px;
    color: #ccc;
    line-height: 30px;
    border-left: #fff 2px solid;
}