body {
  margin: 0 1em;
  font-size: 1.2em;
  font-family: Verdana, Arial, sans-serif;
  text-align: center;
  background-color: #bebebe;
}

h1 {
  font-size: 2em;
}

@media only screen and ( max-width: 440px ) {
  /* mobile devices */
}

@media only screen and ( min-width: 440px ) and ( max-width: 950px ) {
  /* tablets and midsize screens */
} 

@media only screen and ( min-width: 950px ) {
  /* large screens */
}