add transition property

Author: guneyural

DarkModeToggleApp/style.css

@@ -1,4 +1,4 @@
-body {margin: 0;padding:0;font-family: 'Montserrat', Arial, Helvetica, sans-serif;}
+body {margin: 0;padding:0;font-family: 'Montserrat', Arial, Helvetica, sans-serif; transition: 0.4s;}
 
 span {
      position: fixed;
@@ -16,4 +16,4 @@ span:hover {
 
 .margin-top {
      margin-top: 250px;
-}
+}