styles.css

body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }

.map-overlay {
    font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    position: absolute;
    width: 25%;
    top: 0;
    left: 0;
    padding: 10px;
}

.map-overlay .map-overlay-inner {
    background-color: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    border-radius: 3px;
    padding: 10px;
    margin-bottom: 10px;
}

.map-overlay h2 {
    line-height: 24px;
    display: block;
    margin: 0 0 10px;
}

.map-overlay .legend .bar {
    height: 10px;
    width: 100%;
    background: linear-gradient(to right, #fca107, #7f3121);
}

.map-overlay input {
    background-color: transparent;
    display: inline-block;
    width: 100%;
    position: relative;
    margin: 0;
    cursor: ew-resize;
}
.play-button {
  display: block;
  width: 30px;
  height: 30px;
  border:0px;
  transition: 100ms all ease;
  background: url(assets/svg/svg-play-button-icon-1.svg);
}
.play-button.paused {
    background: url(assets/svg/svg-pause-button-icon-1.svg);
}