后台管理系统常见布局

    <div class="header-box">header</div>
    <div class="side-bar">side</div>
    <div class="page-board">page</div>

      .header-box{
        position: fixed;
        width: 100%;
        z-index: 2;
        top: 0%;
        left: 0%;
        height: 60px;
        color: #fff;
        background-color: #000;
      }
      .side-bar{
        position: fixed;
        top: 0%;
        left: 0%;
        width: 200px;
        background-color: aliceblue;
        padding-top: 90px;
        height: 100%;
      }
      .page-board{
        position: fixed;
        top: 0%;
        left: 0%;
        padding: 90px 30px 30px 230px;
        width: 100%;
        height: 100%;
        /* 让右padding生效 */
        box-sizing: border-box;
      }