Fix Sonarscan warnings and also achieve 100% test coverage

Author: bellmano

src/script.js

@@ -10,7 +10,7 @@ function countUpFromTime(countFrom, id) {
   const now = new Date();
 
   // Validate date
-  const isValidDate = !isNaN(countFromDate.getTime());
+  const isValidDate = !Number.isNaN(countFromDate.getTime());
 
   // Get DOM element
   const idEl = document.getElementById(id);

src/style.css

@@ -25,7 +25,7 @@ h2 {
     font-size: 2.5em;
     font-weight: 700;
     padding: 3rem;
-    color: #3cbaf2;
+    color: #2196F3;
     background-color: #0ff;
     background-color: rgba(0, 0, 0, .5);
     text-align: center;
@@ -74,7 +74,7 @@ h2 {
     gap: 20px;
     text-align: center;
     margin: 0 auto;
-    color: #3cbaf2;
+    color: #2196F3;
     background-color: rgba(0, 0, 0, .5);
     padding: 20px;
     max-width: 90%;

tests/script.test.js

@@ -169,6 +169,20 @@ describe('countUpFromTime', () => {
 		expect(Number(mockEl.hours.innerHTML)).toBeGreaterThanOrEqual(0);
 	});
 
+	test('covers for-loop else branch (break) when remainingDays < daysInYear', () => {
+		// Freeze time to a known date so the loop runs exactly once and hits the else branch
+		jest.useFakeTimers();
+		jest.setSystemTime(new Date('Nov 01, 2025 12:00:00'));
+		const mockEl = createMockDOM();
+		global.document.getElementById = jest.fn(() => mockEl);
+		// Choose a date in the previous year but with remaining days less than a full year
+		script.countUpFromTime('Dec 31, 2024 00:00:00', 'countup1');
+		// The function should have written numeric values to the DOM
+		expect(Number(mockEl.years.innerHTML)).toBeGreaterThanOrEqual(0);
+		expect(Number(mockEl.days.innerHTML)).toBeGreaterThanOrEqual(0);
+		jest.useRealTimers();
+	});
+
 	test('updates DOM elements with correct values', () => {
 		jest.useFakeTimers();
 		jest.setSystemTime(new Date('Sep 13, 2025 11:59:00'));