*{
    margin: 0;
}

.header{
    width: 60px;
    background: rgb(255, 255, 255)
}

.header-title{
 font-size:30px;
 font-weight: bold;
 color: black;
}

.main{
    width: 70%;
    margin: 10% 15%;
}

.site-doc-color li{
    display: inline-block;
    vertical-align: middle;
    width: 240px;
    margin-left: 20px;
    margin-bottom: 20px;
    padding: 20px 10px;
    color: #fff;
    text-align: center;
    border-radius: 2px;
    line-height: 33px;
    font-size: 14px;
    cursor: pointer;
}

.site-doc-color li i{
   font-size: 30px;
}