Create style.css

style.css

@@ -0,0 +1,10 @@
+#upload-box {
+    max-height: 300px;
+    overflow-y: scroll;
+    border: 1px solid #ccc;
+    padding: 10px;
+}
+
+#convert-button, #download-zip {
+    width: 100%;
+}