Some time we need to style select box. Here I will show you simple example how to do this. For example we have simple select box html:

<form>
<select>
<option>Item One</option>
<option>Item Two</option>
</select>
</form>

This is style:

body {
  font-family: Arial, sans-serif;
  font-size: 12px;
}

select {
  border: 1px solid #ccc;
  height: 26px;
  line-height: 18px;
  margin: 0;
  padding: 3px;
  background: transparent none no-repeat;
  cursor: pointer;
}

@media screen and (min-width:0) {
  /* for relatively modern browsers including IE 8+ */
  select {
    border-radius: 4px;
    background-image: url("data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAABwAAAAaCAYAAACkVDyJAAAAlElEQVRIx+2VwQ3AIAhFwTiFi7KC7uYGHo1z0Et7MWkjaEiaQOJBDzy/wgdqrXwHWKyAiGAZDnSgHBhC+IfCUgqbKXxgGqhY4QyRQkUK35KLoK01iZd+xZKXRuEfbvdQPPGkAABEhMeLhohE5yfaAufk93791r13zQDmnLNqcOMYg1NKmoJgTRHtmDeaWZvPQweaAi8PXSmZJU3QRAAAAABJRU5ErkJggg==");
    background-position: -50px -50px;
  }
}

@media screen and (-webkit-min-device-pixel-ratio:0) {
  /* for Webkit */
  select {
    -webkit-appearance: none;
    background-position: right center;
    padding: 3px 32px 3px 5px;
  }
}

@-moz-document url-prefix() {
  /* for Firefox */
  select {
    -moz-appearance: none;
    text-indent: 0.01px;
    text-overflow: "";
    background-position: right center;
    padding-right: 16px;
  }

  /* hides the dotted outline on focus in FF (See SO#3773430) */
  select:-moz-focusring {
    color: transparent;
    text-shadow: 0 0 0 #000;
  }
}

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  /* for IE10+ */
  select::-ms-expand {
    display: none;
  }
  select {
    background-position: right center;
    padding-right: 30px;
  }
}

How it works you can on http://jsfiddle.net/sstur/fm5Jt/

Hope this will help you 🙂