Update templates/index.html

templates/index.html

@@ -17,7 +17,7 @@
         color: white;
         margin: 0;
         padding: 20px;
-        background: url("{{ url_for('static', filename='images/black bg.jpeg') }}");
+        background: url("{{ url_for('static', filename='images/black_bg.jpeg') }}");
         background-size: cover;
         background-repeat: no-repeat;
         background-size: cover;