html,
body {
    height: 100%;
    width: 100%;
}
body {
  background-color: #f0f0f0;
    background-image: url('http://www.samuraiworks.org/_demos/images/bs.jpg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;

  margin: 0;
  overflow: hidden;
}
#menu {
  position: absolute;
  left: 10px;
  bottom: 10px;
  width: 98%;
  text-align: right;
}

button {
  font-size: 11px;
  padding: 3px;
  cursor: pointer;
}

/* do it */
iframe {
    overflow: hidden;
}
#css3dDOM {
  width:  960px;
  height: 784px;  /* 918 - 184 */
    padding: 184px 0 50px 0;

    background-image: url('../logo.png');
    background-repeat: no-repeat;
    background-position: center top;

}