CSS：主页布局

1.原理：overflow-y:scroll;

              position:fixed;

2.代码

.el-aside {
    position: fixed;
    left: 0;
    height: 100%;
    width: 13%;
    overflow-y: scroll;
}

.el-aside ul li {
    width: 100%;
}

.el-container {
    padding-left: 7%;
}