diff --git a/theme/classic/scss/classic/post.scss b/theme/classic/scss/classic/post.scss
index a4ad1f8d6d6..33a0f585c0c 100644
--- a/theme/classic/scss/classic/post.scss
+++ b/theme/classic/scss/classic/post.scss
@@ -112,6 +112,7 @@
     .blockcolumn,
     .region-main {
         flex: 0 0 100%;
+        max-width: 100%;
         padding: 0 1rem;
         margin-bottom: 1rem;
     }
@@ -138,11 +139,13 @@
     }
 }
 
-.block_myoverview,
-.block_recentlyaccesseditems {
-    .dashboard-card-deck {
-        .dashboard-card {
-            width: calc(33.33% - #{$card-gutter});
+@include media-breakpoint-up(sm) {
+    .block_myoverview,
+    .block_recentlyaccesseditems {
+        .dashboard-card-deck {
+            .dashboard-card {
+                width: calc(33.33% - #{$card-gutter});
+            }
         }
     }
 }
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 594eb063f74..ab07c5f1a5d 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -19404,6 +19404,7 @@ body {
   .blockcolumn,
   .region-main {
     flex: 0 0 100%;
+    max-width: 100%;
     padding: 0 1rem;
     margin-bottom: 1rem; } }
 
@@ -19596,9 +19597,10 @@ body {
     padding: 0 1rem 0 !important;
     /* stylelint-disable-line declaration-no-important */ } }
 
-.block_myoverview .dashboard-card-deck .dashboard-card,
-.block_recentlyaccesseditems .dashboard-card-deck .dashboard-card {
-  width: calc(33.33% - 0.5rem); }
+@media (min-width: 576px) {
+  .block_myoverview .dashboard-card-deck .dashboard-card,
+  .block_recentlyaccesseditems .dashboard-card-deck .dashboard-card {
+    width: calc(33.33% - 0.5rem); } }
 
 @media (min-width: 768px) {
   .blockcolumn .dashboard-card-deck {