Increase font size of download instructions.

- Partly fixed invisible scroll on small screens in CSS.

web/model-manager.css

@@ -8,6 +8,7 @@
     padding: 8px;
     color: var(--bg-color);
     z-index: 2000;
+    overflow: hidden;
 }
 
 .model-manager .comfy-modal-content {

web/model-manager.js

@@ -2645,7 +2645,7 @@ class DownloadTab {
             $el("div.download-model-infos", {
                 $: (el) => (this.elements.infos = el),
             }, [
-                $el("div", ["Input a URL to select a model to download."]),
+                $el("h1", ["Input a URL to select a model to download."]),
             ]),
         ]);
     }
@@ -2842,7 +2842,7 @@ class DownloadTab {
             );
         });
         if (modelInfosHtml.length === 0) {
-            modelInfosHtml.push($el("div", ["No results found."]));
+            modelInfosHtml.push($el("h1", ["No models found."]));
         }
         else {
             if (modelInfosHtml.length === 1) {