style: add background gradients to antora

Author: julioest

docs/ui/src/css/base.css

@@ -9,12 +9,11 @@ html {
   font-size: var(--body-font-size);
   height: 100%;
   scroll-behavior: smooth;
-  /* Add static gradient background */
   background:
     radial-gradient(circle at 25% 75%, rgba(130, 0, 255, 0.4), transparent 40%),
     radial-gradient(circle at 75% 25%, rgba(0, 98, 255, 0.5), transparent 45%),
     radial-gradient(circle at 50% 50%, rgba(72, 0, 120, 0.6), transparent 60%),
-    radial-gradient(circle at 60% 80%, rgba(200, 0, 255, 0.3), transparent 50%),  
+    radial-gradient(circle at 60% 80%, rgba(200, 0, 255, 0.3), transparent 50%),
     linear-gradient(135deg, #3a0ca3, #4361ee, #7209b7);
   background-attachment: fixed;
   background-blend-mode: screen;