diff --git a/public/style.css b/public/style.css
index f4e864a..6c7ee2a 100644
--- a/public/style.css
+++ b/public/style.css
@@ -9393,13 +9393,13 @@ span.icon-rss::before {
         .timeline-item .avatar-icon.big {
           width: 3.875rem;
           height: 3.875rem; } }
-  .timeline-item .timeline-content-box {
+  .timeline-item .timeline-content-box.timeline-item-bg {
     background-color: rgba(0, 0, 0, 0.2);
     background-color: var(--timeline-content-background); }
-    .timeline-item .timeline-content-box > * {
-      display: block;
-      max-width: 100%;
-      max-height: 80vh; }
+  .timeline-item .timeline-content-box > * {
+    display: block;
+    max-width: 100%;
+    max-height: 80vh; }
 
 .timeline-modal .container {
   max-height: 100vh; }
diff --git a/src/rawdata/scss/_timeline.scss b/src/rawdata/scss/_timeline.scss
index b4ea608..bfc2e82 100644
--- a/src/rawdata/scss/_timeline.scss
+++ b/src/rawdata/scss/_timeline.scss
@@ -19,7 +19,9 @@
     }
 
     .timeline-content-box {
-        @include usevar(background-color, timeline-content-background);
+		&.timeline-item-bg {
+			@include usevar(background-color, timeline-content-background);
+		}
 
         > * {
             display: block;
diff --git a/src/templates/src/include/timeline_item.html b/src/templates/src/include/timeline_item.html
index 3e94466..07053dc 100644
--- a/src/templates/src/include/timeline_item.html
+++ b/src/templates/src/include/timeline_item.html
@@ -51,7 +51,7 @@
 	{{ end }}
 
 	{{ range .EmbedMedia }}
-		<div class="timeline-content-box mt3 {{ if eq .Type mediaembed }}embed{{ end }} br2 overflow-hidden flex justify-center">
+		<div class="timeline-content-box mt3 {{ if eq .Type mediaembed }}embed{{ end }} br2 overflow-hidden flex {{ if not (eq .Type mediaunknown) }}timeline-item-bg justify-center{{ end }}">
 			{{ if eq .Type mediaimage }}
 				<img src="{{ .AssetUrl }}">
 			{{ else if eq .Type mediavideo }}
diff --git a/src/templates/templates.go b/src/templates/templates.go
index 6cca05a..3afe757 100644
--- a/src/templates/templates.go
+++ b/src/templates/templates.go
@@ -246,8 +246,9 @@ var HMNTemplateFuncs = template.FuncMap{
 		}
 	},
 
-	"mediaimage": func() TimelineItemMediaType { return TimelineItemMediaTypeImage },
-	"mediavideo": func() TimelineItemMediaType { return TimelineItemMediaTypeVideo },
-	"mediaaudio": func() TimelineItemMediaType { return TimelineItemMediaTypeAudio },
-	"mediaembed": func() TimelineItemMediaType { return TimelineItemMediaTypeEmbed },
+	"mediaimage":   func() TimelineItemMediaType { return TimelineItemMediaTypeImage },
+	"mediavideo":   func() TimelineItemMediaType { return TimelineItemMediaTypeVideo },
+	"mediaaudio":   func() TimelineItemMediaType { return TimelineItemMediaTypeAudio },
+	"mediaembed":   func() TimelineItemMediaType { return TimelineItemMediaTypeEmbed },
+	"mediaunknown": func() TimelineItemMediaType { return TimelineItemMediaTypeUnknown },
 }