html,body,div {
    height: 100%;
    color: #2c3e50;
}
* {
    margin: 0;
}
body {
    display: grid;
    /*grid-template-columns:2fr 10fr ;*/
}
/*头部*/
.header {
    position: fixed;
    left: 0;
    top: 0;
    height: 60px;
    width: 100%;
    border-bottom: 1px solid #eaecef;
    z-index: 999;
    background-color: #ffffff;
}



/*侧边栏*/
.siderbar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 200px;
    border-right: 1px solid #eaecef;
    display: inline-block;
    float: left;
}


.main {
    width: auto;
    display: inline-block;
    float: right;
    margin-top: 3.6rem;
}
.main-box {
    max-width: 740px;
    margin: 0 auto;
    padding: 2rem 2.5rem;
    /*border: 1px solid #eaecef;*/
}
h2 {
    border-bottom: 1px solid #eaecef;
    padding-bottom: 4.8px;
}
h1,h2,h3,h4,h5,h6,p {
    margin: 30px auto;
}