Revert "Issue #2486453 by LewisNyman, sqndr, heatherwoz, hylid, yoroy, Bojhan:...

Revert "Issue #2486453 by LewisNyman, sqndr, heatherwoz, hylid, yoroy, Bojhan: Set maximum width on Seven"

This reverts commit a70a74fc.

core/themes/seven/css/components/tabs.css

@@ -21,8 +21,8 @@
 /* Span the full width of the viewport */
 .content-header .is-horizontal .tabs:before,
 .content-header .is-collapse-enabled .tabs:before {
-  left: -99em;
-  right: -99em;
+  left: -2.5em;
+  right: -2.5em;
 }
 
 /**

core/themes/seven/css/layout/layout.css

@@ -4,10 +4,3 @@
 .page-content {
   margin-bottom: 80px;
 }
-
-@media all and (min-width: 75em) {
-  .layout-container {
-    width: 1170px;
-    margin: 0 auto;
-  }
-}