/* 分段加载的css代码 */
#btn {
    width: 200px;
    /* height: 150px; */
    float: left;
    text-align: center;
    margin-top: 0px;
    margin-right: 0px;
    margin-left: 0px;
    margin-bottom: 10px;
    font-size: 16px;
    font-weight: bold;
    /* border: 1px solid red; */
}

#btn li {
    /* 这里需要将li设为浮动才能变为横向 */
    display: inline-block;
    /* width: 140px; */
    height: 25px;
    line-height: 25px;
    /* margin-top: 15px; */
    text-align: left;
    cursor: pointer;
    margin-left: 0px; 
   text-indent: 0px;
   margin-left: 10px;
    /* border: 1px solid #999; */
    box-sizing: border-box;
}


#btn li:nth-child(1) {
    color: red;
    cursor: default;
}

.clear {
    clear: both;
}

#mywork2 {
    display: none;  
    height: 1120px;  
}
#mywork1 {
    display: block;    
    height: 1120px;
}