#menu {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 120px;
    background-image: url(../images/bg-left.png);
    background-color: #D72622;
    background-repeat: no-repeat;
    background-size: 128px auto;
    background-position: -4px 0;
    padding-top: 192px;
    overflow: hidden;
    color: #fff;
    border-radius: 0 8px 8px 0;
    text-align: center;
    z-index: 3;
    user-select: none;
}

#menu li{
    position: relative;
    padding: 16px 0;
    cursor: pointer;
    transition: color .2s;
}