Change color and appearance of drop down arrow

You can acheive this with CSS but you are not techinically changing the arrow itself.

In this example I am actually hiding the default arrow and displaying my own arrow instead.

.styleSelect select {
  background: transparent;
  width: 168px;
  padding: 5px;
  font-size: 16px;
  line-height: 1;
  border: 0;
  border-radius: 0;
  height: 34px;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  color: #000;
}

.styleSelect {
  width: 140px;
  height: 34px;
  overflow: hidden;
  background: url("images/downArrow.png") no-repeat right #fff;
  border: 2px solid #000;
}
<div class="styleSelect">
  <select class="units">
    <option value="Metres">Metres</option>
    <option value="Feet">Feet</option>
    <option value="Fathoms">Fathoms</option>
  </select>
</div>

No, cross-browser form custimization is very hard if not impossible to get it right for all browsers. If you really care about the appearance of those widgets you should use a javascript implementation.

see http://www.456bereastreet.com/archive/200409/styling_form_controls/ and http://developer.yahoo.com/yui/examples/button/btn_example07.html


It can be done by:

select{
  background: url(data:image/svg+xml;base64,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) no-repeat 100% 50%;
}

select{
  background: url(data:image/svg+xml;base64,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) no-repeat 100% 50%;
  
  
    -moz-appearance: none;
    -webkit-appearance: none;
    -webkit-border-radius: 0px;
    appearance: none;
    outline-width: 0;
    
    padding: 10px 10px 10px 5px;
    display: block;
    width: 10em;
    border: none;
    font-size: 1rem;
    
    border-bottom: 1px solid #757575;
  }
<div class="styleSelect">
  <select class="units">
    <option value="Metres">Metres</option>
    <option value="Feet">Feet</option>
    <option value="Fathoms">Fathoms</option>
  </select>
</div>

The <select> element is generated by the application and styling is not part of the CSS/HTML spec.

You would have to fake it with your own DIV and overlay it on top of the existing one, or build your own control emulating the same functionality.