body {
  background-color: rgba(180, 180, 180, 0.8);
}

#wrapper {
  position: absolute;
  display: table;
  width: 100%;
  height: 100%;
}

#outer {
  display: table-cell;
  vertical-align: middle;
}

#inner {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
}

img {
  position: absolute;
  width: 34rem;
  top: 45%;
  left: 50%;
  margin-left: -17rem; /* margin is -0.5 * dimension */
  margin-top: -60rem; 
}

#inner div {
  color: #333;
  font-size: 1.5em;
  position: absolute;
  top: 47%;
  margin-right: auto; /* margin is -0.5 * dimension */
  margin-left: auto; /* margin is -0.5 * dimension */
  width: 100%;
  text-align: center;
}

html {
  font-size: 1px;
}

body {
  font-size: 16em;
}

@media only screen and (max-device-width : 640px) {
  html {
    font-size: 2.4px;
  }
}