-fix relative file name

src/style.css

@@ -77,7 +77,7 @@ div.background {
   left: 0;
   width: 100%;
   height: 100%;
-  background: url('bg1.svg') no-repeat center center;
+  background: url('bg.svg') no-repeat center center;
   background-size: contain;
   filter: grayscale(100%);
   z-index: 1;