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

.container {
  position: relative;
  width: 100%;
  height: 100%;
  background: url(../images/intro-desktop.gif) center no-repeat;
  background-size: cover;
}

.mail-link {
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
}

@media (max-width: 1024px) {
  .container {
    background: url(../images/intro-mobile.gif) center no-repeat;
    background-size: cover;
  }
}