body { --text: hsl(0 0% 15%); padding: 2.5rem; font-family: sans-serif; color: var(--text); } body.dark-theme { --text: hsl(0 0% 90%); background-color: hsl(223 39% 7%); } main { max-width: 80rem; text-align: center; } section { display: flex; flex-direction: column; align-items: center; } a { color: var(--text); } form { width: 30rem; margin: 0 auto; } input { width: 100%; } button { cursor: pointer; }