slider.css

.d3-slider {
    position: relative;
    font-family: Verdana,Arial,sans-serif;
    font-size: 1.1em;
    z-index: 2;
    background-color: #f7f7f7;
    box-shadow: 0px 2px 2px #ddd inset;
    border: 1px solid #ccc;
}

.d3-slider-horizontal {
    height: .8em;
}  

.d3-slider-range {
  background:#2980b9;
  left:0px;
  right:0px;
  height: 0.8em;
  position: absolute;
}

.d3-slider-range-vertical {
  background:#2980b9;
  left:0px;
  right:0px;
  position: absolute;
  top:0;
}

.d3-slider-vertical {
    width: .8em;
    height: 100px;
}      

.d3-slider-handle {
    position: absolute;
    width: .1em;
    height: .8em;
    border: .5em solid #999;
    border-radius: 4px;
    background: #eee;
    background: linear-gradient(to bottom, #eee 0%, #ddd 100%);
    z-index: 3;
    cursor: pointer;
}

.d3-slider-handle:hover {
    border: .5em solid #666;
}

.d3-slider-horizontal .d3-slider-handle {
    top: -.5em;
    margin-left: -.4em;
}

.d3-slider-axis {
    position: relative;
    z-index: 1;    
}

.d3-slider-axis-bottom {
    top: .8em;
}

.d3-slider-axis-right {
    left: .8em;
}

.d3-slider-axis path {
    stroke-width: 0;
    fill: none;
}

.d3-slider-axis line {
    fill: none;
    stroke: #aaa;
    shape-rendering: crispEdges;
}

.d3-slider-axis text {
    font-size: 11px;
}

.d3-slider-vertical .d3-slider-handle {
    left: -.25em;
    margin-left: 0;
    margin-bottom: -.6em;      
}