 100px;">
  <option value="value1" style="width: 20px; border: 0.5px solid">Value 1</option> 
  <option value="value2" style="width: 20px; border: 0.5px solid">Value 2</option>
  <option value="value4" style="width: 3px; border: 0.5px solid">Value 3</option>
  <option value="value5" style="width: 20px; border: 0.5px solid">Value 4</option>
  <option value="value3" style="width: 20px; border: 0.5px solid">Value 5</option>
</select>

<select name="options" multiple size="5" style="font-size: 16px; width: 30px