alternative color code

2.3.0 Beta 3

Hello, what am I doing wrong in the code below? System is not working, Dark is not working.

CSS:

:root {
  --my-gradient: linear-gradient(135deg, #2d3393, #22bcdc); /* define gradient variable */
}
@media (prefers-color-scheme: dark) {
:root {
     --my-gradient: linear-gradient(135deg, #1B2129, #1B2129);
 }
}

html[data-variation="alternate"] {
:root {
     --my-gradient: linear-gradient(135deg, #1B2129, #1B2129);
 }
}
.p-pageWrapper {
    z-index: 0;
}...

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