JSFiddle - React, Tailwind, and code Playground

HTML

<article class="artFull">
                  <header>
                    TEST
                  </header>
                  
                  <section class="sect">
                  <h1>
                  TEST
                  </h1>
                  </section>
                  </article>

CSS

.sect {
        background: white;
        border: 2px solid #006797;
        border-radius: 10px;
        box-shadow: 2px 2px 7px #a2c3c3;
        width: 300px;
        float: left;
        margin: 20px 0px 0px 0px;
        font-family: Arial;
}
.artFull {
    height: auto;
   background-color: green;
}