html, body{
  height: 100%;
}
/*change the background-image link to reflect the new link "url(newlink)" */
body {
  background-image: url(../images/HighResBackgroundImage.jpg);
  background-position: center center;
  background-repeat:  no-repeat;
  background-attachment: fixed;
  background-size:  cover;
  background-color: #999;
}

.wrapper {
  height: 100%;
  width: 100%;
}

.logo {
  height: 250px;
  width: 250px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -125px;
  margin-left: -125px;
  z-index:9999;
}

@media (max-width: 960px) {
   .logo{
    height: 200px;
    width: 200px;
    margin-top: -100px;
    margin-left: -100px;
  }
}

@media (max-width: 600px) {
   .logo{
    height: 150px;
    width: 150px;
    margin-top: -75px;
    margin-left: -75px;
  }
}
@media only screen and (max-device-width: 667px){
   .logo{
    height: 400px;
    width: 400px;
    margin-top: -200px;
    margin-left: -200px;
  }
}