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<div class="range-slider">
  <input class="range-slider__range" type="range" value="100" min="0" max="500">
  <span class="range-slider__value">0</span>
</div>

<div class="range-slider">
  <input class="range-slider__range" type="range" value="250" min="0" max="500" step="50">
  <span class="range-slider__value">0</span>
</div>

<div class="range-slider">
  <input class="range-slider__range" type="range" value="400" min="0" max="500">
  <span class="range-slider__value">0</span>
</div> 

var rangeSlider = function(){
  var slider = $('.range-slider'),
      range = $('.range-slider__range'),
      value = $('.range-slider__value');
    
  slider.each(function(){

    value.each(function(){
      var value = $(this).prev().attr('value');
      $(this).html(value);
    });

    range.on('input', function(){
      $(this).next(value).html(this.value);
    });
  });
};

rangeSlider();

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

// Base Colors
$shade-10: #2c3e50 !default;
$shade-1: #d7dcdf !default;
$shade-0: #fff !default;
$teal: #1abc9c !default;


// Reset
* {
  &,
  &:before,
  &:after {
    box-sizing: border-box;
  }
}

body {
  font-family: sans-serif;
  padding: 60px 20px;
  
  @media (min-width: 600px) {
    padding: 60px;
  }
}

.range-slider {
  margin: 60px 0 0 0%;
}


// Range Slider
$range-width: 100% !default;

$range-handle-color: $shade-10 !default;
$range-handle-color-hover: $teal !default;
$range-handle-size: 20px !default;

$range-track-color: $shade-1 !default;
$range-track-height: 10px !default;

$range-label-color: $shade-10 !default;
$range-label-width: 60px !default;

.range-slider {
  width: $range-width;
}

.range-slider__range {
  -webkit-appearance: none;
  width: calc(100% - (#{$range-label-width + 13px}));
  height: $range-track-height;
  border-radius: 5px;
  background: $range-track-color;
  outline: none;
  padding: 0;
  margin: 0;

  // Range Handle
  &::-webkit-slider-thumb {
    appearance: none;
    width: $range-handle-size;
    height: $range-handle-size;
    border-radius: 50%;
    background: $range-handle-color;
    cursor: pointer;
    transition: background .15s ease-in-out;

    &:hover {
      background: $range-handle-color-hover;
    }
  }

  &:active::-webkit-slider-thumb {
    background: $range-handle-color-hover;
  }

  &::-moz-range-thumb {
    width: $range-handle-size;
    height: $range-handle-size;
    border: 0;
    border-radius: 50%;
    background: $range-handle-color;
    cursor: pointer;
    transition: background .15s ease-in-out;

    &:hover {
      background: $range-handle-color-hover;
    }
  }

  &:active::-moz-range-thumb {
    background: $range-handle-color-hover;
  }
}


// Range Label
.range-slider__value {
  display: inline-block;
  position: relative;
  width: $range-label-width;
  color: $shade-0;
  line-height: 20px;
  text-align: center;
  border-radius: 3px;
  background: $range-label-color;
  padding: 5px 10px;
  margin-left: 8px;

  &:after {
    position: absolute;
    top: 8px;
    left: -7px;
    width: 0;
    height: 0;
    border-top: 7px solid transparent;
    border-right: 7px solid $range-label-color;
    border-bottom: 7px solid transparent;
    content: '';
  }
}


// Firefox Overrides
::-moz-range-track {
    background: $range-track-color;
    border: 0;
}

input::-moz-focus-inner,
input::-moz-focus-outer { 
  border: 0; 
}