1st Step:-

Paste Above </head>

<script type='text/javascript'>//<![CDATA[//CSS Readyfunction loadCSS(e, t, n) { "use strict"; var i = window.document.createElement("link"); var o = t || window.document.getElementsByTagName("script")[0]; i.rel = "stylesheet"; i.href = e; i.media = "only x"; o.parentNode.insertBefore(i, o); setTimeout(function () { i.media = n || "all" }) }loadCSS("https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css");//]]></script>

2nd Step:-

Paste Above </head>

Only White

/* START*/<style type='text/css'>/* Slide Up and Down */#slidetop,#slidebottom{background:#fff;margin:0;padding:5px 15px 0;border-radius:0;position:fixed;color:#222;bottom:0;border:1px solid rgba(0,0,0,0.05);border-bottom:0;cursor:pointer;display:none;line-height:2;box-shadow:0 -1px 20px rgba(0,0,0,0.05);backface-visibility:hidden;-webkit-transform:translateZ(0);transform:translateZ(0);transition:all .3s}#slidetop:hover,#slidebottom:hover{background:#fafafa}#slidetop{right:46px;border-radius:5px 0 0 0}#slidebottom{right:0;border-right:0;box-shadow:5px -1px 20px rgba(0,0,0,0.05)}@media only screen and (max-width:768px){#slidetop{right:43px}}</style>/* END*/

Color Options

/* START*/<style type='text/css'>/* Slide Up and Down */#slidetop,#slidebottom{background:#e74c3c;margin:0;padding:5px 15px 0;border-radius:0;position:fixed;color:#fff;bottom:0;cursor:pointer;display:none;line-height:2;backface-visibility:hidden;-webkit-transform:translateZ(0);transform:translateZ(0);transition:all .3s}#slidetop:hover,#slidebottom:hover{background:#333}#slidetop{right:46px;border-radius:5px 0 0 0}#slidebottom{background:#c0392b;right:0}@media only screen and (max-width:768px){#slidetop{right:43px}}</style>/* END*/

3rd Step:-


Paste Above </body>

/* START*/<div id='downfooter'/><a href='#' id='slidetop'><i class='fa fa-chevron-up' title='Slide up'/></a><a href='#' id='slidebottom'><i class='fa fa-chevron-down' title='Slide down'/></a><script type='text/javascript'>//<![CDATA[// Slide Up and Down by www.btechtopper.com!function(o){o(window).scroll(function(){o(this).scrollTop()>75?(o("#slidetop").removeAttr("href"),o("#slidetop").fadeIn()):o("#slidetop").fadeOut()}),o(function(){o("#slidetop").click(function(){return o("html, body").animate({scrollTop:0},"slow"),!1})})}(jQuery),function(o){o(window).scroll(function(){o(this).scrollTop()<0?(o("#slidebottom").removeAttr("href"),o("#slidebottom").fadeOut()):o("#slidebottom").fadeIn()}),o(function(){o("#slidebottom").click(function(){return o("html, body").animate({scrollTop:$("#downfooter").offset().top},"slow"),!1})})}(jQuery);//]]></script>/* END*/