Slider css style

slider.css

slider {
  display: inline-block;
  position: relative;
  height: 22px;
  width: 100%;
  margin: 25px 5px 25px 5px;
  vertical-align: middle;
}
slider span {
  white-space: nowrap;
  position: absolute;
  display: inline-block;
}
slider span.base {
  width: 100%;
  height: 100%;
  padding: 0;
}
slider span.bar {
  width: 100%;
  height: 100%;
  z-index: 0;
  background: #F5F5F5;
  -webkit-border-radius: 1em/1em;
  border-radius: 1em/1em;
  border: 1px solid #E3E3E3;
}
slider span.bar.selection {
  width: 0%;
  z-index: 1;
  background: #F5F5F5;
}
slider span.pointer {
  cursor: pointer;
  width: 20px;
  height: 20px;
  top: 1px;
  background-color: #fff;
  border: 1px solid #000;
  z-index: 2;
  -webkit-border-radius: 1em/1em;
  border-radius: 1em/1em;
}
slider span.pointer:after {
  content: '';
  background-color: #2C3B44;
  width: 6px;
  height: 6px;
  position: absolute;
  top: 6px;
  left: 6px;
  -webkit-border-radius: 1em/1em;
  border-radius: 1em/1em;
}
slider span.pointer:hover:after {
  background-color: #000;
}
slider span.pointer.active:after {
  background-color: #FF5C17;
}
slider span.bubble {
  cursor: default;
  top: -20px;
  padding: 1px 3px 1px 3px;
  font-size: 0.8em;
  font-family: sans-serif;
}
slider span.bubble.selection {
  top: 15px;
}
slider span.bubble.limit {
  color: #808080;
}

I recommend adding the following css to help keep it responsive

slider span.bar.unselected {
  width: 0;
  z-index: 1;
  background: #f5f5f5;
}
slider>input {
  max-width:100%;
}