<!DOCTYPE HTML> <style> body { width: 450px } body, select { font-size: 12px } </style> <!-- In a 450px container, the minimum font size at 15em per line is 30px. This means we map 0px-45px into 30px-45px, so 12px gets mapped to 34px. --> <select><option>One</option><option>Two</option></select>