<div class="range">
  <input type="range" min="1" max="7" steps="1" value="1">
</div>

<ul class="range-labels">
  <li class="active selected">Today</li>
  <li>2 days</li>
  <li>3 days</li>
  <li>4 days</li>
  <li>5 days</li>
  <li>6 days</li>
  <li>7 days</li>
</ul>

body {
  padding: 100px;
}

@mixin rangeThumb {
  width: 18px;
  height: 18px;
  margin: -8px 0  0;
  border-radius: 50%;
  background: #37adbf;
  cursor: pointer;
  border: 0 !important;
}

@mixin rangeTrack {
  width: 100%;
  height: 2px;
  cursor: pointer;
  background: #b2b2b2;
}

.range {
  position: relative;
  width: 550px;
  height: 5px;
}

.range input {
  width: 100%;
  position: absolute;
  top: 2px;
  height: 0;
  -webkit-appearance: none;

  // Thumb
  &::-webkit-slider-thumb {
    -webkit-appearance: none; // needed again for Chrome & Safari
    @include rangeThumb;
  }

  &::-moz-range-thumb {
    @include rangeThumb;
  }

  &::-ms-thumb {
    @include rangeThumb;
  }

  // Track
  &::-webkit-slider-runnable-track {
    @include rangeTrack;
  }

  &::-moz-range-track {
    @include rangeTrack;
  }

  &::-ms-track {
    @include rangeTrack;
  }

  &:focus { // override outline/background on focus
    background: none;
    outline: none;
  }

  &::-ms-track { // A little somethin' somethin' for IE
    width: 100%;
    cursor: pointer;
    background: transparent;
    border-color: transparent;
    color: transparent;
  }
}

// Labels below slider
.range-labels {
  margin: 18px -41px 0;
  padding: 0;
  list-style: none;
  
  li {
    position: relative;
    float: left;
    width: 90.25px;
    text-align: center;
    color: #b2b2b2;
    font-size: 14px;
    cursor: pointer;
    
    &::before {
      position: absolute;
      top: -25px;
      right: 0;
      left: 0;
      content: "";
      margin: 0 auto;
      width: 9px;
      height: 9px;
      background: #b2b2b2;
      border-radius: 50%;
    }
  }
  
  .active {
    color: #37adbf;
  }
  
  .selected::before {
    background: #37adbf;
  }
  
  .active.selected::before {
    display: none;
  }
}

var sheet = document.createElement('style'),  
  $rangeInput = $('.range input'),
  prefs = ['webkit-slider-runnable-track', 'moz-range-track', 'ms-track'];

document.body.appendChild(sheet);

var getTrackStyle = function (el) {  
  var curVal = el.value,
      val = (curVal - 1) * 16.666666667,
      style = '';
  
  // Set active label
  $('.range-labels li').removeClass('active selected');
  
  var curLabel = $('.range-labels').find('li:nth-child(' + curVal + ')');
  
  curLabel.addClass('active selected');
  curLabel.prevAll().addClass('selected');
  
  // Change background gradient
  for (var i = 0; i < prefs.length; i++) {
    style += '.range {background: linear-gradient(to right, #37adbf 0%, #37adbf ' + val + '%, #fff ' + val + '%, #fff 100%)}';
    style += '.range input::-' + prefs[i] + '{background: linear-gradient(to right, #37adbf 0%, #37adbf ' + val + '%, #b2b2b2 ' + val + '%, #b2b2b2 100%)}';
  }

  return style;
}

$rangeInput.on('input', function () {
  sheet.textContent = getTrackStyle(this);
});

// Change input value on label click
$('.range-labels li').on('click', function () {
  var index = $(this).index();
  
  $rangeInput.val(index + 1).trigger('input');
  
});