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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="range">
    <span class="lbl-lft">0</span>
    <span class="lbl-rgt">100</span>
    <input type="range" id="range-input" oninput="updateVal(this.value)"/>
    <div id="range-value" class="range-thumb"></div>
  </div>

  <div class="resize">Resize to width = 768px for fluid slider</div>
!

CSS 

              
                $primary: #626CE4

body
  font-family: 'Roboto', sans-serif
  -webkit-font-smoothing: antialiased
  text-rendering: optimizelegibility

*,
*::before,
*::after
  box-sizing: border-box

.range
  width: 234px
  height: 48px
  border: 0
  background: $primary
  position: absolute
  top: 45%
  left: 50%
  margin-left: -117px
  &:before, &:after
    content: ''
    position: absolute
    top: 0
    z-index: -1
    height: 100%
    width: 28px
    background: $primary
    pointer-events: none
  &:before
    left: -28px
    border-radius: 5px 0 0 5px
  &:after
    right: -28px
    border-radius: 0 5px 5px 0
  input
    -webkit-appearance: none
    position: absolute
    width: calc(100% + 40px)
    height: 100%
    margin: 0
    background-color: transparent
    outline: none
    left: -20px
    -webkit-tap-highlight-color: transparent
    &::-webkit-slider-thumb,
    &::-webkit-media-slider-thumb
      opacity: 0
    &:hover + .range-thumb,
    &:active + .range-thumb
      @media screen and (max-width: 768px)
        transform: translateY(-48px)
      &::before
        display: block

.lbl-lft,.lbl-rgt
  position: absolute
  top: -15px
  color: #1a1a1a
  font-size: 12px
  font-weight: 700
.lbl-lft
  left: -28px
.lbl-rgt
  right: -28px
  text-align: left

.range-thumb
  position: absolute
  top: 0px
  margin-left: -24px
  border-radius: 50%
  border: 5px solid $primary
  background: white
  height: 48px
  width: 48px
  outline: none
  transition: transform .3s ease
  text-align: center
  font-size: 12px
  line-height: 38px
  color: #1a1a1a
  font-weight: 700
  pointer-events: none
  &::before
    display: none
    content: ''
    position: absolute
    z-index: 1
    top: 53px
    left: 50%
    transform: translateX(-50%)
    border-radius: 3px
    width: 2px
    height: 28px
    margin-left: -3px
    background: rgba(white,.25)
    box-shadow: 6px 0 0 rgba(white,.25)
  &::after
    content: ''
    position: absolute
    bottom: -5px
    left: -5px
    width: 48px
    height: 10px
    background-image: url('data:image/svg+xml;base64,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')
    background-repeat: no-repeat
    background-position: center

.resize
  position: fixed
  bottom: 20px
  left: 0
  width: 100%
  text-align: center
  font-size: 14px
  font-weight: 500
  color: #C8CCD4
!

JS 

              
                var rangeVal = document.getElementById('range-value');
var rangeInp = document.getElementById('range-input');

var updateVal = function(val) {
  rangeVal.innerHTML = val;
  rangeVal.style.left = val + '%';
};

updateVal(rangeInp.value);
!
999px

Console