```
<select name="mySelect" class="select-min">
   <option value="0">please select</option>
   <option value="1">item1</option>
   <option value="2">item2</option>
   <option value="3">item3</option>
   <option value="4">item4</option>
   <option value="5">item5</option>
</select>

```

I want to change the option's height and background color when mouse over the option,I tried many times ,but failed