index.html

<span class="okselect">
  	<span class="arrows"></span>
		<select name="dietserious" onfocus="this.up().addClassName('focus');" onblur="this.up().removeClassName('focus');">
			
			    <option value="0">All Assets</option><option value="1">My Assets</option><option value="2">Strictly</option>
			
		</select>
	</span>

style.css

select {
   background: none;
  -webkit-appearance: none; 
  border: none; 
  color: #838383;
}

select:focus {
 outline: none;  
}

.okselect {
  margin: 20px;
 background: -webkit-linear-gradient(top, #ffffff 0%, #e6e6e6
    100%);

border: 1px solid #b2b2b2;
  border-radius: 5px;
  box-shadow: 0 1px 1px #d2d2d2;
  padding: 5px 11px;
  display: inline-block;
  font-size: 14px;
}