Update index.html

Author: tharun9772

support/index.html

@@ -52,7 +52,7 @@
       color: #333;
     }
   body {
-      background-color: #5555FF; 
+      background: linear-gradient(-45deg, #1e1b4b, #312e81, #3730a3, #1e3a8a); 
       margin: 0;
       font-family: Arial, sans-serif;
       color: #fff;