.btnContainer {
    margin-top: 10px;
    float: right;
    height: 32px;
    width: 15px;
    background: red;
    display: block;
    position: relative;
}

#btnIncrement, #btnDecrement {
    height: 16px;
    width: 15px;
    position: absolute;
    left: 0;
    cursor: pointer;
    background-image: url(https://sep.turbifycdn.com/ty/cdn/modernoffice/updown.png);
    background-color: #eee;
    background-repeat: no-repeat;
}

#btnIncrement:hover, #btnDecrement:hover {
 background-color: #dedede;
}

#btnIncrement {
    top: 0;
    background-position: center top;
}

#btnDecrement {
    bottom: 0;
    background-position: center bottom;
}