JSFiddle - React, Tailwind, and code Playground

HTML

<select class="form-control">
<option>something</option>
<option>another value here</option>
</select>

<br>

<select class="mini btn">
<option>something</option>
<option>another value here</option>
</select>

CSS

select.btn-mini {
    height: auto;
    line-height: 14px;
}

/* this is optional (see below) */
select.btn {
    -webkit-appearance: button;
       -moz-appearance: button;
            appearance: button;
    padding-right: 16px;
}

select.btn-mini + .caret {
    margin-left: -20px;
    margin-top: 9px;
}