Edit in JSFiddle

<main>
  <a href="#0">Bloc n°1</a>
  <a href="#0">Bloc n°2</a>
  <a href="#0">Bloc n°3</a>
  <a href="#0">Bloc n°4</a>
</main>

body {
  background: #3e58aa;
  font-size: 80%;
}

main {
  background: #FFFFFF;
  margin: 20px 0;
  padding: 50px;
}

main a {
  background: #CCDCCD;
  color: #3e58aa;
  padding: 40px 30px;
  text-decoration: none;
}