.bodycontent {
    width: 100%;
    border-top: 1px solid #DEDEDE;
}

.course {
    width: 670px;
    margin: 5.9rem auto 5.6rem auto;
}

.course img {
    width: 100%;
}

.pack {
    position: relative;
}

.ahref {
    content: '';
    position: absolute;
    left: 7%;
    bottom: 21%;
    background-color: rgb(0, 0, 0, 0);
    width: 75%;
    height: 30px;
    cursor: pointer;
}


/* 宽度小于768px */

@media screen and (max-width: 768px) {
    .course {
        width: 100%;
    }
}


/* 宽度小于530px  iphone 5/SE 、678 */

@media screen and (max-width: 530px) {
    .course {
        margin-top: 20px;
    }
    .ahref {
        height: 10px;
    }
}