JSFiddle - React, Tailwind, and code Playground

HTML

<div class="conjunto">
    <input type="text" class="input" placeholder="Digite aqui"/>
</div>

CSS

.conjunto{
    width: 100%;
    height: 5%;
    float: left;
    background: #C1C1C1;
    padding: 0;
    margin: 0;
}

.input{
    width: 50%;
    height: 100%;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}