--- /dev/null
+/*
+ * @file
+ * Provides the layout styles for layout_twocol_bricks.
+ *
+ * @todo Using display: flex requires https://www.drupal.org/node/2842298 to be
+ * in before this can be marked as stable.
+ */
+
+.layout--twocol-bricks {
+ display: flex;
+ flex-wrap: wrap;
+}
+
+.layout--twocol-bricks > .layout__region {
+ flex: 0 1 100%;
+}
+
+@media screen and (min-width: 40em) {
+ .layout--twocol-bricks > .layout__region--first-above,
+ .layout--twocol-bricks > .layout__region--second-above,
+ .layout--twocol-bricks > .layout__region--first-below,
+ .layout--twocol-bricks > .layout__region--second-below {
+ flex: 0 1 50%;
+ }
+}