Do you have any extensions running in your browser like dark mode? Please disable them and check if that helps.
You can also force a refresh after you disable them by restarting the step and clicking on CTRL-F5.
try what “hbar1st” is suggesting and if its still “persisting” then try to “reverse engineer” this a bit, as in start “small” and the “build” up to what “step” is asking
for instance start with just “body {}” and see what “error” messages that you get and then “act” on it, i found it useful…
now I see the issue (sorry before I was on my cell and couldn’t tell what was wrong).
You left a space between the word gradient and the following bracket.
As linear-gradient is a CSS function, there should be no spaces between it and the bracket holding the input values.