body,
html {
  height: 100%;
  margin: 0;
  padding: 0;
}


.center-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh; /* Full height */
  width: 100vw; /* Full width */

  background-image: url("../img/pattern.png");
  height: 100%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}