* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #41a5ee;
  color: #fff;
  padding: 1rem;
  text-align: center;
  margin-bottom: 15px;
}

h1 {
  margin: 0;
  font-size: 2rem;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}