[UI]: "Our Mission" block needs a color adjustment for dark theme

[yjrathod]

Describe the UI issue

On the current Welcome page, there's a small Our Mission block that highlights our mission statement.
It looks great in light mode, but in dark mode, the color feels mismatched and stands out awkwardly from the rest of the page.

Screenshots

Additional context

The color of the Our mission block should be adjusted to better align with the dark theme palette for a cleaner and more cohesive look.

There are several other sections with similar blocks, and we’ll need to update each of them as well.

[Nexvyn]

@idanlodzki Kindly assign this issue to me.

[idanlodzki]

@Nexvyn go for it!