update go top btn (#681)

Author: Arhell

_scss/_main.scss

@@ -1775,6 +1775,7 @@ body #footer .links {
   text-align: center;
   color: #236BFD;
   background-color: #ffffff;
+  box-shadow: 0px 0px 4px #236bfd;
   position: fixed;
   bottom: 50px;
   right: 50px;