HTML中隐藏掉select的下拉箭头

<label class="register-left-item fl">证件号</label>
<div class="select select_certificate fl" style="margin-left:4px;">
<span class="select_value" id="_card_type_select_value">身份证</span>
<select id="_card_type" onchange="" name="card_type">
<option value="1" selected=selected>身份证</option>
<option value="2">港澳居民证</option>
<option value="3">护照</option>
<option value="4">军人证</option>
<option value="5">其它证件</option>
</select>
</div>