:root {
  --color-dark-2: #000000;
  --color-text: #fff;
  --color-muted: #c9c9c9;

  --header-height: 60px;
  --t-fast: 0.2s;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--color-dark-2);
  color: var(--color-text);
}

#content {
  min-height: 100vh;
  padding: calc(var(--header-height) + 20px) 20px 20px 20px;
  transition: opacity var(--t-fast) ease;
}

#content h1, #content h2, #content h3 { margin-top: 0; }
#content p { color: var(--color-muted); }

@media (min-width: 769px) {
  body {
    display: flex;
    flex-direction: row;
  }

  #content {
    flex: 1;
    padding: 20px;
  }
}

@media (max-width: 480px) {
  #content {
    padding: 72px 14px 14px;
    font-size: 14px;
  }
}

@media print {
  #content { padding: 20px !important; color: #000; background: #fff; }
}