.maintext{
	text-align:center; 
	font-weight: bold; 
	font-size: 2vw; 
	
      position: absolute;
      top: 45%;
      left: 50%;
      margin-right: -50%;
      transform: translate(-50%, -50%);
}


div.content::after {
  content: "";
  background-image: url('/gears3d.jpg'); 
  background-repeat: no-repeat;
background-size: cover;
  opacity: 0.2;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}