Update index.html

Author: wangfuyii

index.html

@@ -51,7 +51,7 @@ <h3>Important Dates</h3>
 				<li> Workshop date: June 22-25, 2026 (in parallel with the ACNS main conference)</li>
 				<li>
 					Workshop Paper Submission Deadline: March 20, 2026, 23:59 (Anywhere on Earth)
-					<span class="news-badge">NEWS: Submission is Open</span>
+					<span class="rainbow-text">NEWS: Submission is Open</span>
 				</li>
 				<li> Notification of Acceptance/Rejection: April 20, 2026</li>
 				<li> Submission of camera-ready papers: May 1, 2026</li>