Color coding environments is not working

I need to color code my environments, I deal with 4 different envs and I need to tell them apart, fast.

I have code for watermarks and separate colored Logos but those are not in-your-face enough when working in parallel on multiple envs

I know that there is no upgrade safe way to do this, so I've been playing with the core code.

include/MVC/View/tpls/sidecar.tpl

has the hardcoded blue, which I tried to replace with purple (also tried green, red etc)

<!--<div id="main-background" class="fixed h-full w-full bg-gradient-to-tr from-blue-700 to-blue-400 dark:from-blue-900 dark:to-blue-600"></div>-->
<div id="main-background" class="fixed h-full w-full bg-gradient-to-tr from-purple-700 to-purple-400 dark:from-purple-900 dark:to-purple-600"></div>

I checked that the purple was included in the tailwind colors in the root directory of sugar:

tailwind.config.js refers to 

maple-syrup/build/color/tailwind/sugarPalette.js

and it is:

  "purple": {
    "50": "#faf5ff",
    "100": "#f2e5ff",
    "200": "#ead6ff",
    "300": "#d8b4fe",
    "400": "#bf83fc",
    "500": "#a855f7",
    "600": "#9234ea",
    "700": "#7e22ce",
    "800": "#6a21a6",
    "900": "#591c87",
    "950": "#3c0764"
  },

Yet the only thing I achieved is removing the background altogether, which is a step forward as I can tell test envs from PRD, but not ideal since I can't tell the difference between test envs.

Any thoughts on why the background won't recognize any color other than blue?

thanks,

Francesca