slider handle hover state

HTML

<div class="slider">
    <div class="track">
        <div class="value">
            <div class="handle">
                <div class="highlight"></div>
            </div>
        </div>
    </div>
</div>

CSS

html, body {
    background: #333;
    margin: 0;
}

.slider {
    position: absolute;
    height: 8px;
    width: 400px;
    left: 40px;
    top: 100px;
}

.track {
    border-radius: 10px;
    background: rgba(0,0,0,0.8);
    height: 100%;
    width: 100%;
}

.value {
    position: relative;
    border-radius: 10px;
    background: rgba(255,255,255,0.8);
    height: 100%;
    width: 70%;
}

.handle {
    -webkit-transition: all 0.25s ease-out;
    -webkit-transform: scale(0.8);
    background: #fff;
    border-radius: 20px;
    position: absolute;
    margin: -10px 0 0 -10px;
    right: 0;
    height: 20px;
    width: 20px;
    top: 50%;
}

.highlight {
    -webkit-transform: scale(1);
    -webkit-transition: all 0.25s ease-out;
    cursor: pointer;
    border-radius: 10px;
    position: absolute;
    background: #fff;
    opacity: 0;
    height: 150%;
    width: 150%;
    top: -25%;
    left: -25%;
}
.handle:hover {
    -webkit-transform: scale(2);
}
.handle:hover .highlight {
    -webkit-transform: scale(3);
    opacity: 0.5;
}