diff --git a/services/web/frontend/stylesheets/core/mixins.less b/services/web/frontend/stylesheets/core/mixins.less
index 87cb85d989..1915e060bf 100755
--- a/services/web/frontend/stylesheets/core/mixins.less
+++ b/services/web/frontend/stylesheets/core/mixins.less
@@ -807,7 +807,7 @@
 }
 .button-size(@padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius)
   when(@is-new-css = true) {
-  padding: @padding-vertical - @border-size @padding-horizontal;
+  padding: @padding-vertical - round(@border-size) @padding-horizontal;
   font-size: @font-size;
   line-height: @line-height;
   border-radius: @border-radius;