<button class="btn-select">
  select one <i class="ico-caret"></i>
</button>
.btn-select {
  display:inline-block;
  border:1px solid #eee;
  background: #fff;
  position:relative;
  padding:10px 20px 10px 10px
}
.btn-select .ico-caret {
  position:absolute;
  right:8px;
  top:50%;
  margin-top:-2px
}
.ico-caret {
  display:inline-block;
  border-top:4px solid #333;
  border-left:4px solid transparent;
  border-right:4px solid transparent;
}

External CSS

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External JavaScript

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