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main { position: absolute; top: 50%; left: 50%; margin-top: -3em; margin-left: -9em; width: 18em; height: 6em; }
main { position: absolute; top: calc(50% - 3em); left: calc(50% - 9em); width: 18em; height: 6em; }
main { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
main { width: 18em; padding: 1em 1.5em; margin: 50% auto 0; transform: translateY(-50%); }
main { width: 18em; padding: 1em 1.5em; margin: 50vh auto 0; transform: translateY(-50%); }
body { display: flex; min-height: 100vh; margin: 0; } main { margin: auto; }
main { display: flex; align-items: center; justify-content: center; width: 18em; height: 10em; }
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