common.css

:root {
  color-scheme: dark light;
  font-family: system-ui, sans-serif;
  --padding: 0.25rem;
  --theme-color: unset;
}

*,
*:before,
*:after {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: var(--100vh, 100vh);
  max-height: var(--100vh, 100vh);
  width: 100vw;
  max-width: 100vw;
  font-size: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  padding: var(--padding);
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #000;
  }
}

input,
select,
button {
  font-size: 100%;
}

[unresolved] {
  visibility: hidden;
}

:focus:not(:focus-visible) {
  outline: none;
}

button,
.button {
  border: 0;
  border-radius: 0.25rem;
  background: var(--theme-color);
  color: white;
  white-space: nowrap;
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  margin: 0.25rem;
  cursor: pointer;
}