--- /dev/null
+/*
+ * @file
+ * Provides the layout styles for layout_threecol_25_50_25.
+ *
+ * @todo Using display: flex requires https://www.drupal.org/node/2842298 to be
+ * in before this can be marked as stable.
+ */
+.layout--threecol-25-50-25 {
+ display: flex;
+ flex-wrap: wrap;
+}
+
+.layout--threecol-25-50-25 > .layout__region,
+.layout--threecol-25-50-25 > .layout__region--second {
+ flex: 0 1 100%;
+}
+
+@media screen and (min-width: 40em) {
+ .layout--threecol-25-50-25 > .layout__region--first,
+ .layout--threecol-25-50-25 > .layout__region--third {
+ flex: 0 1 25%;
+ }
+ .layout--threecol-25-50-25 > .layout__region--second {
+ flex: 0 1 50%;
+ }
+}