body {
  background-color: black;
  background-image: url('airsoft2.png');
  background-repeat: no-repeat;
  background-size: cover; 
  -ms-background-size: cover; 
  -o-background-size: cover; 
  -moz-background-size: cover; 
  -webkit-background-size: cover;
}

#patch {
  margin-top: 80px;
  width: 800px;
  margin-left: auto;
  margin-right: auto;
}

#patch img {
  width: 100%;
}

@media only screen and (max-width: 840px) {
  #patch {
    width: 500px;
    margin-top: 160px;
  }
}

@media only screen and (max-width: 640px) {
  #patch {
    width: 300px;
    margin-top: 200px;
  }
}