.center-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 90vh;
}

h2{
	font-size: xxx-large;
}


@-ms-viewport { 
 width: device-width;
}
@-o-viewport { 
 width: device-width;
}
@viewport { 
 width: device-width;
}