example.css

@import url('https://fonts.googleapis.com/css?family=Titillium+Web&display=swap');
@import url('https://fonts.googleapis.com/css?family=Noto+Sans&display=swap');

:root {
  --background-color: #f6f6f6;
  --background-color-section: #ccc4;
  --background-color-button-action: #0c0000;
  --font-color: #222;
  --font-color-header: #474747;
  --link-color: #3f8ef5;

  /*theme-changer vars*/
  --tc-foreground-color: var(--font-color);
  --tc-background-color: var(--background-color);
  --tc-on-background-color: var(--background-color-section);
}

:root.dark {
  --background-color: #121212;
  --background-color-section: #ccc4;
  --background-color-button-action: #fcffff;
  --font-color: #f6f6f6;
  --font-color-header: #c0c0c0;
  --link-color: #809fff;
}

@media (prefers-color-scheme: dark) {
  :root.light {
    --background-color: #f6f6f6;
    --background-color-section: #ccc4;
    --background-color-button-action: #0c0000;
    --font-color: #222;
    --font-color-header: #474747;
    --link-color: #3f8ef5;
  }

  :root {
    --background-color: #121212;
    --background-color-section: #ccc4 --background-color-button-action: #fcffff;
    --font-color: #f6f6f6;
    --font-color-header: #c0c0c0;
    --link-color: #809fff;
  }
}

body {
  font-family: 'Noto Sans', Tahoma, Arial, Helvetica, sans-serif;
  column-count: 1;
  padding: 1em;
  width: 285px;
  margin: auto;
  background-color: var(--background-color);
  color: var(--font-color);
  border-radius: 2em;
}

.copy {
  align-content: center;
  font-size: small;
  text-align: center;
}

section {
  background-color: var(--background-color-section);
  border-radius: 2em;
  padding: 1em;
  margin: 1em 0em;
}

div.panel {
  float: left;
  width: auto;
}

table {
  margin: 12px 12px 12px 12px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Titillium Web', "Trebuchet MS", "Trebuchet", "Nimbus Sans L", sans-serif;
  color: var(--font-color-header);
  margin: 1em 0 .3em;
}

p {
  margin: 1em 0 .3em;
}

a {
  color: var(--link-color);
}

code {
  color: var(--font-color);
  background: #ccc;/*var(--background-color);*/
  font-size: inherit;
  word-wrap: break-word;
  box-decoration-break: clone;
  padding: 0.1rem 0.3rem 0.2rem;
  border-radius: 0.2rem;
}

pre code {
  display: block;
  white-space: pre-line;
  -webkit-overflow-scrolling: touch;
  overflow-x: auto;
  max-width: 100%;
  min-width: 100px;
  padding: 0.3rem;
  border: none;
}

pre.prettyprint {
  border: none;
}

pre.license {
  overflow-x: auto;
  word-wrap: break-word;
  white-space: pre-line;
  padding: 1.0rem;
}

@media screen and (min-width: 640px) {
  div.panel {
    width: auto;
    width: 46%;
    margin: 0 2% 0 2%;
  }
}

@media(min-width: 320px) {
  body {
    width: 95%;
  }
}

@media(min-width: 400px) {}

@media(min-width: 768px) {
  body {
    width: 760px;
  }
}