diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 995568e1475..6ef498c79be 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -2837,7 +2837,7 @@ $ui-header-logo-wordmark-width: 99px;
   overflow: hidden;
 }
 
-@media screen and (width >= 631px) {
+@media screen and (width > $mobile-breakpoint) {
   .columns-area {
     padding: 0;
   }
@@ -5736,7 +5736,7 @@ a.status-card {
   user-select: text;
   display: flex;
 
-  @media screen and (width <= 630px) {
+  @media screen and (width <= $mobile-breakpoint) {
     margin-top: auto;
   }
 }
@@ -6095,7 +6095,7 @@ a.status-card {
     border-radius: 0 0 16px 16px;
     border-top: 0;
 
-    @media screen and (max-width: $no-gap-breakpoint) {
+    @media screen and (max-width: $mobile-breakpoint) {
       border-radius: 0;
       border-bottom: 0;
       padding-bottom: 32px;
@@ -9097,8 +9097,9 @@ noscript {
   backdrop-filter: var(--background-filter);
   border: 1px solid var(--modal-border-color);
   padding: 24px;
+  box-sizing: border-box;
 
-  @media screen and (max-width: $no-gap-breakpoint) {
+  @media screen and (max-width: $mobile-breakpoint) {
     border-radius: 16px 16px 0 0;
     border-bottom: 0;
     padding-bottom: 32px;
diff --git a/app/javascript/styles/mastodon/variables.scss b/app/javascript/styles/mastodon/variables.scss
index 2ba3dfb49d6..92b4770fe38 100644
--- a/app/javascript/styles/mastodon/variables.scss
+++ b/app/javascript/styles/mastodon/variables.scss
@@ -88,6 +88,7 @@ $media-modal-media-max-width: 100%;
 $media-modal-media-max-height: 80%;
 
 $no-gap-breakpoint: 1175px;
+$mobile-breakpoint: 630px;
 
 $font-sans-serif: 'mastodon-font-sans-serif' !default;
 $font-display: 'mastodon-font-display' !default;