:root {
  --background-color: #ffffff;
  --text-color: #333333;
  --border-color: #eee;
  --hover-background: #f5f5f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --border-color: #333;
    --hover-background: #2a2a2a;
  }
}

html,
body {
  padding: 0;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
  line-height: 180%;
  background-color: var(--background-color);
  color: var(--text-color);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

* {
  box-sizing: border-box;
}

@media (min-width: 600px) {
  article {
    width: 600px;
    max-width: 70vw;
  }
}