JSFiddle - React, Tailwind, and code Playground

HTML

<div id="a">
    <div id="intermediario">
        <div id="b">conteĂşdo</div>
    </div>
</div>

CSS

#a {
    width: 35%;
    height: 300px;
    background-color: #c64800;
    float: left;
}
#intermediario {
    position: relative;
    padding-top: 53%;
    background-color: rgba(255, 255, 255, 0.8);
}
#b {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 255, 0.5);
}