Restructure

css/html-preview.css

@@ -0,0 +1,43 @@
+/* Preview Splash Screen - Matches Modern Theme */
+
+div.preview-splash {
+    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
+    url('../preview/img/xibologo.png') no-repeat center center;
+    background-attachment: fixed;
+    background-size: 200px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 100vh;
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+    color: #ffffff;
+}
+
+div.preview-splash::after {
+    content: '';
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.2);
+    z-index: 1;
+}
+
+/* Preview widget container styling */
+.preview-widget {
+    background-color: #ffffff;
+    border-radius: 0.5rem;
+    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+    padding: 1.5rem;
+    margin: 1rem;
+}
+
+.preview-widget-title {
+    font-size: 1.125rem;
+    font-weight: 600;
+    color: #1f2937;
+    margin-bottom: 1rem;
+    padding-bottom: 1rem;
+    border-bottom: 1px solid #e5e7eb;
+}