* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  background-color: #f9f9f9;
  font-family: Arial, sans-serif;
  font-size: 14px;
  line-height: 20px;
  color: #333;
}

div.content {
  display: flex;
  justify-content: center;
  padding: 100px;
  font-size: 2em;
}