JSFiddle - React, Tailwind, and code Playground

HTML

<div id="first">
    <input type="text" value="First" /><br />
    <select>
        <option value="1">One</option>
        <option value="2">Two</option>
    </select>   
</div>

<div id="second">
    <input type="text" value="Second" /><br />
    <select>
        <option value="1">One</option>
        <option value="2" selected="selected">Two</option>
    </select>                
</div>

CSS

* {
    padding: 0;
    margin: 0;        
}

#first input {
    width: 196px;
    border: 2px solid #EEE;
}
#first select {
    width: 200px;
}

#second input {
    box-sizing: border-box;
    width: 200px;
}
#second select {
    width: 200px;
}