.topform {
    width: 100%;
    height: 80px;
    background: #017ad7;
}

form input {
    width: 30%;
    display: inline-block;
    margin: 20px 10px;
    height: 40px;
    line-height: 40px;
    background: #fff;
    padding-left: 20px;
    font-size: 18px;
}

.topform .mui-btn {
    width: 30%;
    display: inline-block;
    margin: 20px 10px;
    height: 40px;
    line-height: 40px;
    background: #404144;
    color: #fff;
    font-size: 18px;

}

.topform .mui-btn i {
    margin-left: 10px;
    font-size: 16px;
}

h2{
    font-size: 30px;
    text-align: center;
    margin: 50px auto 10px;
    color: #2a2a2a;
}
.title2{
    text-align: center;
    font-size: 16px;
    color: #2a2a2a;
    margin-bottom: 30px;
}
.yuyue{
    display: block;
    margin: 40px auto;
    width: 240px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: #d12742;
    color: #fff;
    font-size: 22px;
}
ul {
    overflow: hidden;
    clear: both;
    margin: 0 auto;
}
.lesson ul li {
    float: left;
    text-align: center;
}

.detail {
    overflow-y: scroll;
    text-align: left;
    padding-left: 16px;
    padding-bottom: 20px;
}

.detail h3 {
    color: #fa003b;
    font-size: 20px;
    margin-top: 16px;
}

.detail h3 span {
    color: #000;
}

.detail p {
    font-size: 16px;
}
.lesson a {
    display: inline-block;
    width: 160px;
    height: 40px;
    line-height: 40px;
    border: 2px solid #d12742;
    border-radius: 20px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    color: #d12742;
}