index.css

@import url('https://fonts.googleapis.com/css2?family=Fira+Code&display=swap');

:root {
  font-family: 'Fira Code Nerd Font', 'Fira Code Nerd Font Mono', 'Fira Code',
    system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: light dark;
  background-color: var(--dark);
  color: rgba(255, 255, 255, 0.87);

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;

  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);

  --z-background: 1;
  --z-foreground: 2;

  --light: #bdbdbd;
  --dark: #242424;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: var(--light);
  }
  button {
    background-color: #f9f9f9;
  }
}

body {
  margin: 0;
  min-width: 100vw;
  min-height: 100vh;
  z-index: var(--z-body);
  overflow: hidden;
}

.bg-dark {
  color: var(--light);
  color-scheme: dark light;
}

.bg-light {
  color: var(--dark);
  color-scheme: light dark;
}

#root {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  place-content: center;
  place-items: center;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
  color: var(--light);
}
button:hover {
  border-color: white;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

a,
.link {
  background-color: transparent;
  border: none;
  padding: unset;
  color: inherit;
  text-decoration: none;
  font-weight: normal;
}

.animatedCircle {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  clip-path: circle(0% at 50% 50%);
  animation: expandCircle 2s var(--ease-out-quint) forwards;
  z-index: var(--z-background);
}

@keyframes expandCircle {
  0% {
    clip-path: circle(0% at 50% 50%);
  }
  100% {
    clip-path: circle(75% at 50% 50%);
  }
}