diff --git a/.changeset/rich-parrots-explode.md b/.changeset/rich-parrots-explode.md
new file mode 100644
index 00000000..11df7c70
--- /dev/null
+++ b/.changeset/rich-parrots-explode.md
@@ -0,0 +1,5 @@
+---
+'myst-to-react': patch
+---
+
+Set min grid columns at main breakpoint
diff --git a/packages/myst-to-react/src/grid.tsx b/packages/myst-to-react/src/grid.tsx
index b4a1ef63..ae7c2a55 100644
--- a/packages/myst-to-react/src/grid.tsx
+++ b/packages/myst-to-react/src/grid.tsx
@@ -100,7 +100,7 @@ function gridColumnClasses(columns?: number[]): string {
   }
   return [
     // getColumnClassName(gridClassNames.main, columns[0]),
-    getColumnClassName(gridClassNames.sm, columns[0]),
+    getColumnClassName(gridClassNames.main, columns[0]),
     getColumnClassName(gridClassNames.md, columns[1]),
     getColumnClassName(gridClassNames.lg, columns[2]),
     getColumnClassName(gridClassNames.xl, columns[3]),