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.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>