Hello @etoomambel , I think they just ask you to put the value red to the background element. before the existing background element. hope this helped. happy coding and welcome to the community.
Previous challenges discussed how to create and use a CSS variable.
In this challenge, it is wanting you to add a fallback value (another CSS rule without using a variable) to specify the background color of the element in case the browser can’t find your variable.
In that case, the element would still have a background color declared that it can use instead of your CSS variable.
In CSS, rules declared later in the cascade will override previous rules or inherited rules.
So by adding a rule to specify the background color before your variable, if the browser can’t find your variable, it will use that rule instead. Browsers that support and can find your CSS variable will use that because it will come later in the ruleset.
This is why it is called a fallback. It is like a “plan b” that the browser can use in case the variable doesn’t work.