html {
  height: 99%;
  min-height: 99%;
}

body {
  height: 99%;
  min-height: 99%;
  background: url(Yo5hi.png) no-repeat center fixed;
  background-size: cover;
}

@media only screen and (max-width: 980px) {
  body {
    background: url(Yo5hi.png) no-repeat center fixed;
    background-size: cover;
  }
}

@media (orientation: landscape) {
  body {
    background: url(Yo5hi.png) no-repeat center fixed;
    background-size: cover;
  }
}