#UI_Left {
    width: 244px;
    overflow: hidden;
    float: left;
    position: fixed;
    z-index: 999;
    left: -244px;
    box-shadow: 0px 0px 10px 0 rgb(205 215 234);
}

#UI_Right {
    width: 70%;
    float: left;
}

#UI_Central {
    width: 28%;
    overflow: hidden;
    float: right;
    /* position: relative; */
}

#UI_Main {
    width: 100% !important;
    margin: 0 auto;
    height: calc(100% - 90px);
    padding: 35px 30px 0 30px;
    box-sizing: border-box;
}