So I have managed to get another long way to do something that should be quite simple!
"<div style='width:"&'Register Selecter'.Width&";height:"&'Register Selecter'.Height-1&"px;background: rgb(255,123,103);
background: linear-gradient(180deg, rgba(255,123,103,1) 0%, rgba(255,220,237,1) 80%)'></div>"
Making my background a HTML text and formatting it with the above.