.nav-left{
    position: fixed;
    width: 200px;
    height: 100%;
    top: 0;
    left: 200px;
    background-color: #031f2d;
    border-right: 1px solid #09152d;
    box-shadow: 8px 0 26px 0px rgba(0,0,0,0.5);
    transition: all 0.3s;
    transform: translate3d(-200px,0,0);
    box-sizing: border-box;
    padding: 15px;
    color: #fff;
    z-index: 999999;
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.nav-left .el-button{
    background: #1a3848;
    width: 150px;
    margin-bottom: 20px;
}