style.css

body {
  overflow: hidden;
  display: table;
  background: url(http://th08.deviantart.net/fs70/PRE/f/2014/071/5/5/blue_space_by_whendell-d79zabi.jpg);
  background-size: cover;
}

#lose{
  position: fixed;
  height: 100vh;
  width: 100vw;
  background-color: rgba(0,0,0,.7);
  color: red;
  font-size: 64px;
/*  display: table-cell;
  vertical-align: center;
*/  z-index: 1000;
display: inline-block;
}

#msg{
  margin: 0 auto;
}

#sky {
  /*background-color: cyan;*/
  position: absolute;
  width: 100%;
  height: 80vh;
  top: 0;
}

#ground {
  /*background-color: brown;*/
  position: absolute;
  height: 20vh;
  width: 100%;
  bottom: 0;
}

#player {
  background: url(http://fc04.deviantart.net/fs70/i/2012/106/3/2/space_cat_by_pekepeke0-d4wc8ay.png);
  background-size: 120%;
  position: relative;
  background-color: fuchsia;
  width: 20vh;
  height: 20vh;
  top: 60vh;
  z-index: 9;
}

#van {
  background: url(http://static.ddmcdn.com/gif/storymaker-photos-sharks-in-space-shark-week-1108040-515x344.jpg);
  background-size: cover;
  position: relative;
  background-color: red;
  width: 20vh;
  height: 15vh;
  top: 75vh;
  z-index:9;
}

#pizza {
  background: url(http://www.electronicproducts.com/uploadedImages/Sensors_and_Transducers/Image_Sensors_and_Optical_Detectors/3d%20Pizza%20NASA.PNG);
  background-size: cover;
  position: relative;
  background-color: green;
  width: 10vh;
  height: 7vh;
  top: 40vh;
  z-index:9;
}