JSFiddle - React, Tailwind, and code Playground

HTML

<form action="#" id="test" name="test">
    <fieldset>
        <input type="text" class="first" />
        <input type="text" class="second" />
        <input type="text" class="third" />
        
    </fieldset>
    
</form>

CSS

fieldset{
    overflow: hidden;
    float: left;
    background-color: #eee;
}
input {
    display: block;
}
input.first{ width: 150px; }
input.second{ width: 200px; }
input.third { width: 250px; }