diff --git a/templates/customer.html b/templates/customer.html
index 0997001..e6907c8 100644
--- a/templates/customer.html
+++ b/templates/customer.html
@@ -34,12 +34,18 @@
       align-items: center;
       justify-content: center;
       padding: 1rem;
-      background: var(--ccm-surface);
+      background: #ffffff;
+    }
+    [data-bs-theme="dark"] .logo-preview-box {
+      background: #1a1e24;
     }
     .logo-preview-box img {
       max-height: 100px;
       max-width: 100%;
       object-fit: contain;
+      background: #ffffff;
+      padding: 8px;
+      border-radius: 0.5rem;
     }
     .logo-preview-box .placeholder {
       color: var(--ccm-muted);