ol ol li{
    margin-right: 30px;
    font-size: 17px;
}
.list-type{
    font-size: 20px;
    margin: 15px;
    background-color: #d2d2d2;
    border-radius: 5px;
}
.span1 {
    margin-top: 15px;
    background-color: #7dafff;
    padding-right: 10px;
    padding-left: 10px;
    border-radius: 5px;
}
.span2 {
    height: 30px;
    width: 680px;
    padding-right: 10px;
    padding-left: 10px;
}

p{
    font-weight: bold;
    font-size: 23px;
}

.back-to-top {
    cursor: pointer;
    position: fixed;
    bottom: 20px;
    right: 20px;
    display:none;
}