* {
    padding: 0;
    margin: 0;
}

#box {
    position: relative;
    width: 100%;
    height: 40px;
    margin: 0 auto;
    margin-top: 10px;
    background-color: #e8e8e8;
    box-shadow: 1px 1px 5px rgba(0,0,0,0.2);
}

.bgColor {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    background-color: lightblue;
}

.txt {
    position: absolute;
    width: 100%;
    height: 40px;
    line-height: 40px;
    font-size: 14px;
    color: #000;
    text-align: center;
}

.slider {
    position: absolute;
    left: 0;
    top: 0;
    width: 50px;
    height: 38px;
    border: 1px solid #ccc;
    background: #fff;
    text-align: center;
    cursor: move;
}

    .slider > i {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
    }

    .slider.active > i {
        color: green;
    }