body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1 {
  flex-shrink: 0;
  text-align: center;
  width: 100%;
}

main {
  flex: 1 0 auto;
  padding: 10px 10px;
}

footer {
  flex-shrink: 0;
  width: 100%;
  text-align: center;
  padding: 10px 0;
}

:root {
  --bg-color: #fff;
  --text-color: #333;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
}