* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  text-align: left;
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0;
  padding: 0;
}

header {
  background-color: #666;
  color: white;
  padding: 1rem;
}

header h1.logo {
  font-size: 20px;
  margin: 0;
}

header h1.logo a {
  color: #ffffff;
  text-decoration: none;
}
header h1.logo a:visited {
  color: #ffffff;
}

header h1.logo img {
  max-height: 3rem;
  vertical-align: middle;
  display: inline-block;
  margin-right: 1rem;
}

a {
  text-decoration: none;
  color: var(--link-color);
}

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