diff --git a/static/skin/kiwix.css b/static/skin/kiwix.css
index 5a92b07c..36189173 100644
--- a/static/skin/kiwix.css
+++ b/static/skin/kiwix.css
@@ -13,6 +13,7 @@ html {
 body {
     position: relative;
     box-sizing: border-box;
+    background: #f9f9f9;
 }
 
 .loader {
@@ -101,6 +102,10 @@ body {
     padding: 20px;
 }
 
+#content_iframe {
+    background: #f9f9f9;
+}
+
 #uiLanguageSelector {
   display: none;
 }
diff --git a/test/library_server.cpp b/test/library_server.cpp
index 92dc005e..3540d0eb 100644
--- a/test/library_server.cpp
+++ b/test/library_server.cpp
@@ -1189,7 +1189,7 @@ TEST_F(LibraryServerTest, no_name_mapper_catalog_v2_individual_entry_access)
   "    <title>Welcome to Kiwix Server</title>\n" \
   "    <link\n" \
   "      type=\"text/css\"\n" \
-  "      href=\"/ROOT%23%3F/skin/kiwix.css?cacheid=3948b846\"\n" \
+  "      href=\"/ROOT%23%3F/skin/kiwix.css?cacheid=11123d22\"\n" \
   "      rel=\"Stylesheet\"\n" \
   "    />\n" \
   "    <link\n" \
diff --git a/test/server.cpp b/test/server.cpp
index a271ce8c..d10c4873 100644
--- a/test/server.cpp
+++ b/test/server.cpp
@@ -71,7 +71,7 @@ const ResourceCollection resources200Compressible{
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/isotope.pkgd.min.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/isotope.pkgd.min.js?cacheid=2e48d392" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/kiwix.css" },
-  { STATIC_CONTENT,  "/ROOT%23%3F/skin/kiwix.css?cacheid=3948b846" },
+  { STATIC_CONTENT,  "/ROOT%23%3F/skin/kiwix.css?cacheid=11123d22" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/mustache.min.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/mustache.min.js?cacheid=bd23c4fb" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/taskbar.css" },
@@ -288,7 +288,7 @@ TEST_F(ServerTest, CacheIdsOfStaticResources)
   const std::vector<UrlAndExpectedResult> testData{
     {
       /* url */ "/ROOT%23%3F/",
-R"EXPECTEDRESULT(      href="/ROOT%23%3F/skin/kiwix.css?cacheid=3948b846"
+R"EXPECTEDRESULT(      href="/ROOT%23%3F/skin/kiwix.css?cacheid=11123d22"
       href="/ROOT%23%3F/skin/index.css?cacheid=ae79e41a"
     <link rel="apple-touch-icon" sizes="180x180" href="/ROOT%23%3F/skin/favicon/apple-touch-icon.png?cacheid=f86f8df3">
     <link rel="icon" type="image/png" sizes="32x32" href="/ROOT%23%3F/skin/favicon/favicon-32x32.png?cacheid=79ded625">
@@ -329,7 +329,7 @@ R"EXPECTEDRESULT(                  <img src="${root}/skin/download-white.svg?cac
     },
     {
       /* url */ "/ROOT%23%3F/viewer",
-R"EXPECTEDRESULT(    <link type="text/css" href="./skin/kiwix.css?cacheid=3948b846" rel="Stylesheet" />
+R"EXPECTEDRESULT(    <link type="text/css" href="./skin/kiwix.css?cacheid=11123d22" rel="Stylesheet" />
     <link type="text/css" href="./skin/taskbar.css?cacheid=42e90cb9" rel="Stylesheet" />
     <link type="text/css" href="./skin/autoComplete/css/autoComplete.css?cacheid=f2d376c4" rel="Stylesheet" />
     <script type="text/javascript" src="./skin/polyfills.js?cacheid=a0e0343d"></script>