Issue #631 : Input in truth table generator should be visible

[divijsingla]

Input text in TruthTable now visible in both dark and light mode

Fixes : Earlier the text in truth table input was not visible in dark mode as the text color was being changed to white on a white background, I changed its color to black, now it is visible in both modes..

Changes done:

• [x] Task 1

Screenshots

Previously:

Now:

Preview Link(s): https://learn.circuitverse.org/docs/logic-design/canonical.html

✅️ By submitting this PR, I have verified the following

• [x] Checked to see if a similar PR has already been opened 🤔️
• [x] Reviewed the contributing guidelines 🔍️
• [x] Sample preview link added (add the link(s) for all the pages changed/updated from the checks tab after checks complete)
• [ x] Tried Squashing the commits into one

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[divijsingla]

Lgtm 🎉

So when will the PR be merged?

[Harsh-1Byte]

Hey! @Prerna-0202 can I contribute as the changes are not visible on the site