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<div class="btn-select">
<p class="label">選択してください</p>
<select class='select'>
  <option value=''>選択してください</option>
  <option value='1'>選択肢1</option>
  <option value='2'>選択肢2</option>
  <option value='3'>選択肢3</option>
              body {
  text-align: center;

.btn-select {
  width: 300px;
  margin: 20px auto;
  position: relative;
  background: #333;
  border-radius: 6px;
  cursor: pointer; /* IEでcursorがチラついたので */

.label {
  color: #fff;
  position: absolute;
  width: 100%;
  z-index: 1;

.select {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  display: block;
  cursor: pointer;
  width: 100%;
  border: none;
  padding: 20px;
  opacity: 0;
  position: relative;
  z-index: 2;

/* IE10以上で矢印を消す */
.select::-ms-expand {
  display: none; 

/* フォーカス時 */
.select:focus {
  z-index: -1;
  opacity: 1;
// selectと同じようにonchangeでラベルを変えたいときはJSを用いる
$('.select').on('change', function(){
  var $this = $(this)
  var $option = $this.find('option:selected');
  // onchange後にフォーカスしてるのが嫌な場合
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