fix: Correct timer CSS selector from #timer to .timer + Add Reset buttonFix/timer css selector

[VanshikaAsthana]

🔗 Fixes

Closes #148

🐛 Bug Fix 1 — CSS Selector Mismatch

Problem

style.css targets #timer (ID selector) but index.html uses
class="timer". This caused the timer's intended styles — blue color,
2rem font size, bold weight, letter spacing — to never apply.

Fix

Changed #timer → .timer in style.css.

✨ Bug Fix 2 — No way to Reset Timer

Problem

After stopping the timer, seconds was never cleared. No reset
functionality existed.

Fix

Added resetTimer() function and a Reset button in the UI.

📸 Before & After

| Timer plain black, no styling | Timer blue, bold, correctly styled |

🧪 Testing

• Opened index.html locally in browser
• Verified timer renders blue and styled after CSS fix
• Verified Reset button clears timer back to 00:00:00

Submitted as part of GSSoC 2026 contribution.