add basic layout scss

src/scss/_layout.scss

@@ -0,0 +1,11 @@
+.l-wrapper {
+	max-width: $column-max-width;
+	margin: 0 auto;
+}
+
+.l-column {
+	width: 100%;
+	height: 100%;
+	padding: 0 16px;
+}
+

src/scss/_variables.scss

@@ -9,3 +9,5 @@ $bp-max-s: 575.98px;
 $bp-max-m: 767.98px;
 $bp-max-l: 991.98px;
 $bp-max-xl: 1199.98px;
+
+$column-max-width: 1140px;

src/scss/style.scss

@@ -1,3 +1,4 @@
 @import "variables";
 @import "node_modules/modern-css-reset/src/reset";
 @import "base";
+@import "layout";