div.BGopacity {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  background-color: rgba(0, 0, 0, 0.5);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  
}
		
  div.Header1 {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  background: url(../assets/images/0-vX300.png);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  padding: 45px;
  font-size: 20px;
  z-index: 10;
}
body {
    background: url(../assets/images/1-BG-001.png) no-repeat center center fixed; 
        -webkit-background-size: 100% 100%;
        -moz-background-size: 100% 100%;
        -o-background-size: 100% 100%;
        background-size: 100% 100%;
}
 div.MHDDiagram {
  position: -webkit-sticky;
  background: url(../assets/images/MHD Diagram.png);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  padding: 45px;
  font-size: 20px;
  z-index: 10;
}

  .tab {
            display: inline-block;
            margin-left: 15px;
        }