JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset>
    <label>label</label><span><input type="text" /></span>
    <label>longer label</label><span><input type="text" /></span>
</fieldset>

CSS

label{ float: left; }
            
            span
            {
                display: block;
                overflow: hidden;
                padding-right: 5px;
                padding-left: 10px;
            }
                   
            span > input{ width: 100%; }