header[role="banner"] { background: url(""); background-position: center; background-size: cover; } @media (prefers-color-scheme: dark) { header[role="banner"] { background: linear-gradient( rgba(43, 54, 65, 0.6), rgba(43, 54, 65, 0.6) ), url(""); background-position: center; background-size: cover; } }