<!DOCTYPE html>
<html>
<head>
<style type="text/css">
	select {
		margin: 10px;
	}
</style>
</head>
<body>

<div style="border: 3px solid; width: 320pt;">
	<select name="options" style="width: 100%;">
	  <option value="value1">Value 1</option> 
	  <option value="value2">Value 2</option>
	  <option value="value3">Value 3</option>
	</select>
</div>	

<div style="border: 3px solid; width: 320pt;">
	<select name="options" style="width: 50%;">
	  <option value="value1">Value 1</option> 
	  <option value="value2"