* {
  box-sizing: border-box;
}

body {
  background: #eee;
  color: #111;
  font-family: Verdana, Tahoma, sans-serif;
  font-size: 13px;
  margin-top: 5%;
}

main {
  border: 1px solid #ccc;
  background: linear-gradient(#fff, #ddd) #fff;
  max-width: 1024px;
  margin: auto;
  padding: 16px;
}

main.warning {
  max-width: 480px;
}
main.warning a {
  display: block;
  border: 1px solid #ccc;
  box-shadow: inset 0px 1px white;
  background: linear-gradient(#eee, #ddd) #fff;
  padding: 8px;
  text-decoration: none;
  font-weight: bold;
}
main.warning a:hover {
  background: #eee;
}
main.warning a:active {
  background: #ddd;
}

header {
  padding: 8px;
  padding-top: 48px;
  background: orangered;
  color: #fff;
}
header h1 {
  margin: 0;
}