select
{
border:none;
}
<select>
<otpion value='male'>Male<开发者_如何学C/option>
<otpion value='female'>Female</option>
</select>
Use the CSS property outline: none;
Although this is sometimes frowned upon as it can make your site difficult to use with the keyboard (when you use tab to shift through elements, no outline will appear).
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