Enhance Zen welcome styles: improve button scaling, update layout properties, and add background effects

src/browser/base/content/zen-styles/zen-buttons.css

@@ -34,7 +34,7 @@ xul|button:is(.expander-down) {
 .footer-button {
   transition: scale 0.2s;
   &:active {
-    scale: scale(0.98);
+    scale: 0.98;
   }
 }
 

src/browser/base/content/zen-styles/zen-welcome.css

@@ -6,6 +6,7 @@
   display: flex;
   align-items: center;
   justify-content: center;
+  -moz-window-dragging: drag;
 }
 
 :root[zen-welcome-stage] #zen-sidebar-splitter {
@@ -48,34 +49,39 @@
   justify-content: start;
   align-items: start;
   display: none;
+  background: var(--zen-branding-bg);
+  border-radius: 1em;
+  overflow: hidden;
+  position: relative;
+  width: 60%;
+  height: 60%;
+  box-shadow: var(--zen-big-shadow);
 
   #zen-welcome-page-sidebar {
-    background: rgba(255, 255, 255, 0.07);
     flex-direction: column;
     justify-content: space-between;
-    padding: 3.5rem;
+    padding: 3.8rem;
     width: 40%;
     height: 100%;
-    backdrop-filter: blur(10px);
     overflow: hidden;
   }
 
   #zen-welcome-page-sidebar-buttons {
     flex-direction: column;
-    gap: 5px;
+    gap: 10px;
   }
 
   #zen-welcome-page-sidebar-content {
     & h1 {
-      font-size: 2.2rem;
+      font-size: xx-large;
       font-weight: 600;
       margin-bottom: 1rem;
     }
 
     & p {
-      font-size: 1.1rem;
+      font-size: medium;
       margin: 0 0 1.1rem 0;
-      opacity: .6;
+      color: light-dark(rgba(0, 0, 0, 0.6), rgba(255, 255, 255, 0.6));
     }
 
     & > * {
@@ -87,4 +93,14 @@
     justify-content: center;
     opacity: 0;
   }
+
+  #zen-welcome-page-content {
+    background: light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.1));
+    width: 60%;
+    height: 100%;
+    position: relative;
+    overflow: hidden;
+    justify-content: center;
+    align-items: center;
+  }
 }

src/browser/base/zen-components/ZenWelcome.mjs

@@ -51,6 +51,7 @@
     init() {
       document.getElementById('zen-welcome-pages').style.display = 'flex';
       document.getElementById('zen-welcome-start').remove();
+      window.maximize();
       animate('#zen-welcome-pages', { opacity: [0, 1] });
     }