JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option class="ch">Чебурашка</option>        
    <option class="kr">Крокодил</option>
    <option>микки маус</option>
</select>

CSS

select option.ch {font-size: 16px;}
select option.kr {font-size: 10px;color:red;}