:root[colour-mode="light"] {
  --page-bg: #e6e6e6;
  --content-bg: #fff;
  --text: #333333;
  --primary: #01408e;
}

:root[colour-mode="dark"] {
  --page-bg: #222;
  --content-bg: #404040;
  --text: #cccccc;
  --primary: #8fceff;
}

html {
  padding: 0;
  margin: 0;
  height: 100%;
  background-color: var(--page-bg);
}

body {
  font-family: Georgia, sans-serif;
  line-height: 1.5;
  max-width: 600px;
  min-height: 100%;
  margin: 0 auto;
  padding: 20px;
  background-color: var(--content-bg);
  color: var(--text);
  box-shadow: 0 0 5px 5px rgba(0, 0, 0, 0.2);
  transition: all 1s;
}

h1,
a {
  color: var(--primary);
}

:root[colour-mode="light"] .hide-when-light {
  display: none;
}

:root[colour-mode="dark"] .hide-when-dark {
  display: none;
}