Fix background image quotes

Author: Ahana-Awasthi

style.css

@@ -95,7 +95,7 @@
 
 .big::before {
     content: "";
-    background-image: url("assets/pexels-george-milton-7034452.jpg");
+    background-image: url('assets/pexels-george-milton-7034452.jpg');
     background-size: cover;
     height: 100%;
     width: 100%;