Update the visual appearance in page contents

[boulderdaze]

The PR #538 introduces a new, simpler, cleaner visual design, but the new color scheme affects the readability of the page content.

Before the change, the pages used a dark background with light-colored text. With the new white background, the existing text colors no longer provide sufficient contrast, making the content harder to read.

Ideas

• Update the page content style to improve visual contrast and readibility.

[K20shores]

remember that you can check this using lighthouse. It can help identify contrasting colors.

I'd also recommend using colors from the NCAR color palette