.postcard { width: 100vw; height: 100vh; object-fit: cover; position: absolute; z-index: -1; user-select: none; pointer-events: none; } @media (prefers-color-scheme: light) { .postcard { filter: blur(16px) contrast(25%) brightness(175%); } } @media (prefers-color-scheme: dark) { .postcard { filter: blur(16px) contrast(50%) brightness(50%); } }