JSFiddle - React, Tailwind, and code Playground

HTML

<p>
    <label>Produkt</label>
    <input type="text">
</p>
<p>
    <label>Anzahl/Einheit</label>
    <input type="number" min="0" max="100" step="0.5" />
    <select>
        <option value="Dosen">Dosen</option>
        <option value="Kg">Kg</option>
        <option value="Tüten">Tüten</option>
    </select> 
</p>

CSS

*{
    padding: 0;
    margin: 0;
}
body{
    background-color: rgba(30,30,30, 1);
    padding: 40px;
    font-size: 1em;
    color: rgba(255,255,255, 1);
}
select, input{
    color: rgba(255,255,255, 0.3);
    padding: 7px;
    border-radius: 3px;
    background-color: rgba(255,255,255, 0.1);
    border: none;
    transition: all 0.4s;
    margin-left: 4px;
}
option, select:hover, input:hover{
    color: rgba(0,0,0, 0.7);
    background-color: rgba(39, 158, 222, 1);
}
option, select:focus, input:focus{
    color: rgba(255,255,255, 0.9);
    background-color: rgba(0,0,0, .3);
}
input[type='number']{
    width: 40px;
    color: rgba(255,255,255, 0.9);
    padding-left: 10px;
}
select{
    padding: 6px;
}
select:focus option{
    padding: 5px;
}
option{
    border-top: 1px solid rgba(255,255,255, 0.3);
}
label{
    display: inline-block;
    width: 120px;
    padding: 6px;
    /* jetzt wirds echt unwichtig :D */
    background-color: rgba(255,255,255, 0.05);
    border-radius: 3px;
}
p{
    padding: 5px;
}