body {
  margin:0;
  padding:0;
  background:url('background.jpg') center/cover no-repeat fixed;
  font-family: Arial, sans-serif;
}
.overlay {
  background: rgba(0,0,0,0.55);
  padding: 40px;
  margin: 20px;
  border-radius: 20px;
  color: white;
  max-width: 500px;
}
h1 {margin:0; font-size: 32px;}
h2 {margin-top:10px; font-size: 20px;}
.lang a {color: #fff; text-decoration: underline;}