Multi coloured frame

Site URL: https://murugiah.com/

Hi! so i'm looking to add a multi coloured gradient border frame around the edge of my entire site. I also need to go all the way to the bottom of the site so that when i scroll down the bottom of the border is at the bottom of the website. Hope this makes sense. 

17 hours ago, Murugiah said:

Site URL: https://murugiah.com/

Hi! so i'm looking to add a multi coloured gradient border frame around the edge of my entire site. I also need to go all the way to the bottom of the site so that when i scroll down the bottom of the border is at the bottom of the website. Hope this makes sense. 

Could you try this in custom css of the main page

body {
   position: relative;
   z-index: 1;
   padding: 30px;
   border: 5px solid #f00;
   background: #ff9600;
}
body:before {
   content: "";
   position: absolute;
   z-index: -1;
   top: 5px;
   left: 5px;
   right: 5px;
   bottom: 5px;
   border: 5px solid #ffea00;
   background: #4aa929;
}
body:after {
   content: "";
   position: absolute;
   z-index: -1;
   top: 15px;
   left: 15px;
   right: 15px;
   bottom: 15px;
   border: 5px solid #00b4ff;
   background: #fff;
}