Design Flaw (In Dark-mode): (×) Symbol appears which should not be there and NaN error message font needs adjustment for dark-theme

[Pratham-Onkar-Singh]

Issue Description: When switching to dark mode, an unnecessary (×) symbol appears on certain UI elements, which should not be displayed. Additionally, the font for the NaN error message does not adjust appropriately for dark mode, making it inconsistent with the overall theme.

Expected Behavior:

• The (×) symbol should not be visible in dark mode.
• The NaN error message font should adjust to be consistent with the dark mode theme, ensuring readability and visual harmony.

Steps to Recreate:

• Go to the website Binary Calculator.
• Switch from light mode to dark mode.
• Observe the appearance of the (×) symbol in places where it shouldn't be.
• Trigger a NaN error message (example- by clicking on octal without typing anything) and observe that its font does not align with the dark mode design(i.e it is not properly readable).

Request: Kindly assign this issue to me (Pratham Onkar Singh) so I can resolve it.

[Pratham-Onkar-Singh]

@Alitindrawan24 Please do assign this issue to me(Pratham Onkar Singh) so that i can resolve an annoying visual bug.

[Alitindrawan24]

Already assigned @Pratham-Onkar-Singh