JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head><title>test</title></head>
    <body>
        <div class='class1'>
            I should have a red background!
        </div>

        <div class='class2'>
            <div class='class1'>
                I should have a blue background!
            </div>
        </div>
    </body>
</html>

CSS

.class1 {
    background-color: red;
}

.class2 {
  /*Contents are irrelevant*/
}

.class2 > .class1 {
    background-color: blue;
}