fixed negative margins for alternate posts list

assets/sass/_theme/blocks/posts.sass

@@ -175,9 +175,7 @@
                     + .square,
                     + .landscape
                         margin-top: -15%
-                    + .post:not(.portrait),
-                    + .post:not(.landscape),
-                    + .post:not(.square)
+                    + .post:not(.portrait, .square, .landscape)
                         margin-top: -5%
             @include in-page-without-sidebar
                 width: col(10)