What's the easiest way to change the background of the page borders

We’d like to change ONLY the left and right border background, but not the background behind the text. Does anyone have suggestions about what/where/how to make such a change? Thanks in advance for anything anyone can share!

That should do it

body {
  background-color: <your color>;

#main-outlet {
  background-color: $secondary;

PERFECT! Thanks @zogstrip!

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