Update static/app.css

static/app.css

@@ -177,3 +177,15 @@ em {
     font-family: monospace;
     box-shadow: inset 0 0 2px #999;
 }
+.file-preview-bubble {
+    align-self: flex-start;
+    background-color: #e0e0e0;
+    color: #444;
+    font-size: 0.85rem;
+    padding: 8px 12px;
+    border-radius: 10px;
+    margin: 4px 0 0 10px;
+    max-width: 60%;
+    font-family: monospace;
+    box-shadow: inset 0 0 2px #999;
+}