diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 2c9e36f660..df4a05e465 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2040,6 +2040,7 @@ switch {
         background-color: $insensitive_bg_color;
   }
   slider {
+    margin: -1px;
     min-width: 45px;
     min-height: 27px;
     border: 1px solid;
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 45b255accd..0c196d9046 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -2590,6 +2590,7 @@ switch {
     background-image: none;
     background-color: #333636; }
   switch slider {
+    margin: -1px;
     min-width: 45px;
     min-height: 27px;
     border: 1px solid;
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 970ac067e6..0aac5d8af2 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -2597,6 +2597,7 @@ switch {
     background-image: none;
     background-color: #f1f1f1; }
   switch slider {
+    margin: -1px;
     min-width: 45px;
     min-height: 27px;
     border: 1px solid;