header {
  display: flex;
  flex-direction: column;
  align-items: center;
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 640px) {
  main {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    width: 100%;
  }
}

p#vim-brag {
  text-align: center;
}

p#vim-brag:not(:hover) {
  animation: flash-blink 0.8s steps(1, end) infinite;
}

p#vim-brag:hover {
  animation: rotate-spin 1s linear infinite;
}

@keyframes flash-blink {
  0%, 50% {
    visibility: visible;
    opacity: 1;
  }
  50.01%, 100% {
    visibility: hidden;
    opacity: 0;
  }
}

@keyframes rotate-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}