Update static/app.css

static/app.css

@@ -178,7 +178,7 @@ em {
     box-shadow: inset 0 0 2px #999;
 }
 .file-preview-bubble {
-    align-self: flex-start;
+    align-self: flex-end;
     background-color: #e0e0e0;
     color: #444;
     font-size: 0.85rem;