JSFiddle - React, Tailwind, and code Playground

HTML

<section id="section1"></section>

<section id="section2"></section>

<section id="section3"></section>

<section id="section4"></section>

CSS

section {
    width: 200px;
    height: 100px;
    border: 1px solid grey;
}

#section1 {
    background: url(http://placehold.it/350x150) auto 100px;
}

#section2 {
    background: url(http://placehold.it/350x150) 0 0 / auto 100px;
}

#section3 {
    background: url(http://placehold.it/350x150) 0 0 / cover;
}

#section4 {
    background: url(http://placehold.it/350x150) 0 0;
    background-size: cover;
}