Corner ribbon
.corner-ribbon {
width: 200px;
background: #e43;
position: absolute;
top: 25px;
left: -50px;
text-align: center;
line-height: 50px;
letter-spacing: 1px;
color: #f0f0f0 ;
transform: rotate(-45deg);
-webkit-transform: rotate(-45deg);
}
.corner-ribbon a{
color: #f0f0f0 ;
text-decoration: none;
}
/* Custom styles */
.corner-ribbon.sticky {
position: fixed;
}
.corner-ribbon.shadow {
box-shadow: 0 0 3px rgba(0, 0, 0, .3);
}
.corner-ribbon.top-right {
top: 25px;
right: -50px;
left: auto;
transform: rotate(45deg);
-webkit-transform: rotate(45deg);
}
.corner-ribbon.blue{background: #39d;}
<link rel="stylesheet" href="style.css">
<div class="corner-ribbon top-right sticky blue"><a href="javascript:void(0)">Github</a></div>