html多出了高度，无法去掉

Question

 @charset "UTF-8";
/*main部分开始*/
.main {
    height: 469px;
    background-color: #526DA0;
}
.main-bread {
    height: 49px;
    line-height: 49px;
    color: #fff;
    font-size: 16px;
}
.main-bread a {
    color: #fff; /*a标签不继承颜色，所以需要单独的设置*/
}
.main-bread a:hover {
    text-decoration: underline;
}
.main-video-left {
    width: 860px;
    height: 400px;
    background-color: #fff;
    float: left;
}
.main-video-right {
    width: 275px;
    height: 375px;
    /*background-color: blue;*/
    background-color: #fff;
    float: right;
    padding: 25px 18px 0 16px;
    color: #333;
}
.main-video-right h2 {
    font-size: 22px;
    color: #333;
    font-family: "microsoft yahei";
    height: 35px;
}
.main-video-right-desc {
    line-height: 24px;
}
.main-video-right-datetime {
    height: 50px;
    line-height: 50px;
}
.main-video-right-course {
    height: 65px;
}
.main-video-right-price {
    font-size: 30px;
    font-family: "microsoft yahei";
    color: #ff6400;
}
.main-video-right-buy {
    height: 45px;
}
.main-video-right-btn a {
    width: 130px;
    height: 46px;
    line-height: 46px;
    text-align: center;
    background-color: #ff6400;
    display: inline-block;
    color: #fff;
    font-size: 18px;
    font-family: "microsoft yahei";
    border-radius: 10px;
}
/*main部分结束*/

/*course部分开始*/
.course {
    height: 300px;
    background-color: #F2F2F2;
    padding-top: 34px;
}
.course-left {
    width: 860px;
    height: 300px;
    /*background-color: red;*/
    float: left;
}
.course-left-top {
    height: 44px;
    line-height: 44px;
    border-bottom: 1px solid #ccc;
}
.course-left-top ul li {
    float: left;
    font-size: 14px;
    color:#333;
    font-family: "microsoft yahei";
    padding: 0 20px;
}
.course-left-top ul li.current {
    border-top: 3px solid #ff6400;
    border-right: 1px solid #ccc;
    border-left: 1px solid #ccc;
    border-bottom: 2px solid #fff; /*li本身的2像素白色底部边框，压住父盒子的底部边框*/
    height: 40px;
    line-height: 40px;
    background-color: #fff;

}
.course-left-bottom {
    height: 968px;
    border: 1px solid #ccc;
    border-top: 0;
    background-color: #fff;
    padding: 32px 20px 0;
}
.course-left-bottom ul li{
    height: 45px;
    line-height: 45px;
    border-bottom: 1px dashed #ccc;

}
.course-left-bottom ul li a {
    width: 76px;
    height: 23px;
    line-height: 23px;
    text-align: center;
    border: 1px solid #ff6400;
    display: inline-block; /*将行元素转换成行内块元素*/
    float: right;
    margin-top: 10px;
    border-radius: 12px;
    padding: 0 10px;
    position: relative; /*相当于是限制子元素i*/
}
.course-left-bottom ul li a i {
    width: 0;
    height: 0;
    border-width: 4px;
    border-style: dashed dashed dashed solid;
    border-color: transparent  transparent transparent #ff6400;
    position: absolute;
    top: 50%;
    margin-top: -4px;
    right: 10px;
}
/*#tabs-1 li {*/
    /*width: 0;*/
    /*height: 0;*/
    /*border-width: 4px;*/
    /*border-style: dashed dashed dashed solid;*/
    /*border-color: transparent  transparent transparent #ff6400;*/
    /*/!*top: 50%;*!/*/
    /*margin-top: -4px;*/
    /*right: 10px;*/
/*}*/
.course-right {
    width: 311px;
    height: 1047px;
    /*background-color: blue;*/
    float: right;
}
.course-right h2 {
    height: 44px;
    line-height: 44px;
    font-size: 18px;
    color: #333;
}
.course-right ul  li {
    height: 230px;
    border: 1px solid #ccc;
    margin-bottom: 30px;
}
.course-right ul  li:hover {
    border: 1px solid #ff6400;
}
.course-right ul  li img {
    width: 100%;/*让图片的宽度和父级元素是一样宽*/
}
.course-right ul  li p {
    height: 60px;
    line-height: 60px;
    font-size: 18px;
    padding: 0 11px;
    color: #333;
}
.course-right ul  li p a {
    width: 73px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    background-color: #ff6400;
    display: inline-block;
    float: right;
    font-size: 14px;
    margin-top: 16px;
    border-radius: 10px;
    color: #fff;
}
/*course部分结束*/ 

Answer 1

这样子让看什么的？？