Minor change: changed color or Download button

src/components/TextToMermaid.vue

@@ -1133,7 +1133,7 @@
   /* Download button in fullscreen - same size as reset button */
   .modal-header .download-btn {
     padding: 6px 12px;
-    background: #6c757d;
+    background: #007bff;
     color: white;
     border: none;
     border-radius: 4px;