diff --git a/src/Umbraco.Web.UI.Client/src/css/umbraco-blockgridlayout.css b/src/Umbraco.Web.UI.Client/src/css/umbraco-blockgridlayout.css
new file mode 100644
index 0000000000..a03c585ba6
--- /dev/null
+++ b/src/Umbraco.Web.UI.Client/src/css/umbraco-blockgridlayout.css
@@ -0,0 +1,50 @@
+.umb-block-grid__layout-container {
+	position: relative;
+	display: grid;
+	grid-template-columns: repeat(var(--umb-block-grid--grid-columns, 1), minmax(0, 1fr));
+	grid-auto-flow: row;
+	grid-auto-rows: minmax(50px, min-content);
+
+	column-gap: var(--umb-block-grid--column-gap, 0);
+	row-gap: var(--umb-block-grid--row-gap, 0);
+}
+.umb-block-grid__layout-item {
+	position: relative;
+	/* For small devices we scale columnSpan by three, to make everything bigger than 1/3 take full width: */
+	grid-column-end: span min(calc(var(--umb-block-grid--item-column-span, 1) * 3), var(--umb-block-grid--grid-columns));
+	grid-row: span var(--umb-block-grid--item-row-span, 1);
+}
+
+.umb-block-grid__area-container,
+.umb-block-grid__block--view::part(area-container) {
+	position: relative;
+	display: grid;
+	grid-template-columns: repeat(
+		var(--umb-block-grid--area-grid-columns, var(--umb-block-grid--grid-columns, 1)),
+		minmax(0, 1fr)
+	);
+	grid-auto-flow: row;
+	grid-auto-rows: minmax(50px, min-content);
+
+	column-gap: var(--umb-block-grid--areas-column-gap, 0);
+	row-gap: var(--umb-block-grid--areas-row-gap, 0);
+}
+.umb-block-grid__area {
+	position: relative;
+	height: 100%;
+	display: flex;
+	flex-direction: column;
+	/* For small devices we scale columnSpan by three, to make everything bigger than 1/3 take full width: */
+	grid-column-end: span
+		min(calc(var(--umb-block-grid--area-column-span, 1) * 3), var(--umb-block-grid--area-grid-columns));
+	grid-row: span var(--umb-block-grid--area-row-span, 1);
+}
+
+@media (min-width: 1024px) {
+	.umb-block-grid__layout-item {
+		grid-column-end: span min(var(--umb-block-grid--item-column-span, 1), var(--umb-block-grid--grid-columns));
+	}
+	.umb-block-grid__area {
+		grid-column-end: span min(var(--umb-block-grid--area-column-span, 1), var(--umb-block-grid--area-grid-columns));
+	}
+}