<div></div>
@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  height: 100%;
}

body {
  width: 100vw;
  height: min(100vh, 100%);
  font-family: "Exo", Arial, sans-serif;
  background-color: #557;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
}

div {
  width: 100%;
  height: min(40vh, 100%);
  --w: 760px;
  --min-size: 600px;
  --max-size: 100%;
  background: #1f1b1c url(https://picsum.photos/1920/800) no-repeat center;
  background-size: clamp(var(--min-size), var(--w) * 1000, var(--max-size)) auto;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.