JSFiddle - React, Tailwind, and code Playground

HTML

<div id="web">
    <div id="anuncio1" class="volando"></div>
    <div id="anuncio2" class="volando"></div>    
</div>

CSS

#web {
    position: relative;
    width: 400px;
    height: 500px;
    margin: 0 auto;
    background: green;
}

.volando {
    position: absolute;
    top: 0;
    width: 50px;
    height: 150px;
    background: firebrick;
}

#anuncio1 {
    left: -50px;
}

#anuncio2 {
    right: -50px;
}