body
{
	background: url(Inside-the-Factory.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
.semi_dark
{
	background-color: rgba(0,0,0,.6);
	border-radius: 10px;
}
.semi_light
{
	background-color: rgba(255,255,255,.8);
	border-radius: 10px;
}