Update close button positioning, see hydephp/framework#499

Author: caendesilva

sass/HydeSearchMenu.scss

@@ -63,9 +63,9 @@
 		}
 
 		#searchMenuCloseButton {
-			position: absolute;
+			position: fixed;
 			top: 1rem;
-			right: 1rem;
+			right: 0;
 			z-index: 150;
 			opacity: 0.75;
 			margin-right: 1rem;