diff --git a/app/assets/stylesheets/common/base/personal-message.scss b/app/assets/stylesheets/common/base/personal-message.scss
index e51a95ff348..444ceeb53e0 100644
--- a/app/assets/stylesheets/common/base/personal-message.scss
+++ b/app/assets/stylesheets/common/base/personal-message.scss
@@ -1,5 +1,5 @@
 .archetype-private_message {
-  --pm-border-radius: 2em;
+  --pm-border-radius: 0;
   --pm-padding: 1.25em;
 
   @keyframes current-user-background-fade-highlight {
diff --git a/app/assets/stylesheets/common/foundation/base.scss b/app/assets/stylesheets/common/foundation/base.scss
index bef8f379d8b..57b99b3580b 100644
--- a/app/assets/stylesheets/common/foundation/base.scss
+++ b/app/assets/stylesheets/common/foundation/base.scss
@@ -6,8 +6,8 @@
   --topic-body-width: #{$topic-body-width};
   --topic-body-width-padding: #{$topic-body-width-padding};
   --topic-avatar-width: #{$topic-avatar-width};
-  --d-border-radius: initial;
-  --d-border-radius-large: initial;
+  --d-border-radius: 2px;
+  --d-border-radius-large: 2px;
   --d-nav-pill-border-radius: var(--d-border-radius);
   --d-button-border-radius: var(--d-border-radius);
   --d-input-border-radius: var(--d-border-radius);