How to adjust the width of a HTML combobox (Drop down box or Select box)

You can use external CSS (Cascading Style Sheets) or Inline Styles. NOTE: External CSS stylesheets are best to use.

Example using inline styles.

<select style="width:200px;">
    <option>Option 1</option>
    <option>Option 2</option>
    <option>Option 3</option>
</select>

Example using external CSS

HTML

<select class="dropdown">
    <option>Option 1</option>
    <option>Option 2</option>
    <option>Option 3</option>
</select>

CSS

.dropdown{
    width: 200px;
}