html {
  width: 100%;
  height: 100%;
  
  background: #11e8bb; /* Old browsers */
  background: -moz-linear-gradient(top,  #11e8bb 0%, #8200c9 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(top,  #11e8bb 0%,#8200c9 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to bottom,  #11e8bb 0%,#8200c9 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#11e8bb', endColorstr='#8200c9',GradientType=0 ); /* IE6-9 */
  overflow: hidden;
}

body {
  margin: 0;
  padding: 0;
}