better spacing and change header margin

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>

themes/openpowerfoundation/assets/css/groups.scss

@@ -1,4 +1,3 @@
-
 main {
 	&.groups {
 		@media screen and (max-width: $lg) {
@@ -32,7 +31,6 @@ main {
 		}
 	}
 }
-
 .promo__section {
 	align-items: center;
 	&.groups {
@@ -41,6 +39,6 @@ main {
 		}
 	}
 }
-
 #workgroupsingle {
+	padding-top: 3.75rem;
 }