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https://codepen.io/fabriceleven/pen/bwkGXB

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" />
<div class="selectdiv ">
  <label>
      <select>
          <option selected> Select Box </option>
          <option>Option 1</option>
          <option>Option 2</option>
          <option>Last long option</option>
      </select>
  </label>
</div>

body {
  background: #f2f2f2;
}

.selectdiv {
  position: relative;
  /*Don't really need this just for demo styling*/
  
  float: left;
  min-width: 200px;
  margin: 50px 33%;
}

.selectdiv:after {
    content: '\f078';
    font: normal normal normal 17px/1 FontAwesome;
    color: #0ebeff;
    right: 11px;
    top: 6px;
    height: 34px;
    padding: 15px 0px 0px 8px;
    border-left: 1px solid #0ebeff;
    position: absolute;
    pointer-events: none;
}

/* IE11 hide native button (thanks Matt!) */
select::-ms-expand {
display: none;
}

.selectdiv select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  /* Add some styling */
  
  display: block;
  width: 100%;
  max-width: 320px;
  height: 50px;
  float: right;
  margin: 5px 0px;
  padding: 0px 24px;
  font-size: 16px;
  line-height: 1.75;
  color: #333;
  background-color: #ffffff;
  background-image: none;
  border: 1px solid #0ebeff;
  -ms-word-break: normal;
  word-break: normal;
  position: relative;
  z-index: 1;
  background-color: transparent;
}