feat(modals): centered modals vertically (#1024)

Author: AlexeyPonomarenko

components/modal/Modal.module.scss

@@ -46,7 +46,7 @@
 }
 
 .overlay {
-  align-items: flex-start;
+  align-items: center;
   background: rgba(#201f1f, 0.5);
   bottom: 0;
   display: flex;