* {
  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;
  margin-bottom: 1rem;
}

header h1 {
  margin: 0;
}

main {
  margin: 1rem;
}