#divMain{
margin:auto;		
width:80%;
}
#divGitHub{
top:0px;
right:0px;
width:200px;
height:200px;
overflow:hidden;
position:absolute;
z-index:1;
pointer-events:none;
}
#GitHub{
background-color:#800;	
border:solid 2px black;	
color:white;
cursor:pointer;
font:bold 14px Arial,Helvetica,sans-serif;
height:20px;
padding-top:3px;
position:absolute;
right:60px;
text-align: center;
transform:translate(50%,-50%) rotate(45deg);
text-shadow: 0 0 8px black;
top:60px;
width:240px;
-webkit-touch-callout: none;
-webkit-user-select: none;
-moz-user-select: none;
pointer-events:auto;
}
#GitHub:after{
content:'Star me on GitHub';
}
#GitHub:hover{
background-color:#f00;
}
#demo1{
height:500px;
}