Center text in notifications (#4461)

Signed-off-by: Juho Heikka <juho.heikka@gmail.com>

src/renderer/components/notifications/notifications.scss

@@ -50,6 +50,7 @@
       white-space: pre-line;
       padding-left: $padding;
       padding-right: $padding * 2;
+      align-self: center;
 
       a {
         color: inherit;
@@ -63,9 +64,5 @@
         box-shadow: 0 0 20px var(--boxShadow);
       }
     }
-
-    .close {
-      margin-top: -2px;
-    }
   }
 }