diff --git a/core/src/components/button/button.scss b/core/src/components/button/button.scss
index 2089444995..ea85c3a6ef 100644
--- a/core/src/components/button/button.scss
+++ b/core/src/components/button/button.scss
@@ -106,6 +106,7 @@
z-index: 0;
display: inline-block;
overflow: hidden;
+ box-sizing: border-box;
height: var(--height);
diff --git a/core/src/components/button/test/expand/index.html b/core/src/components/button/test/expand/index.html
index fa14e140ae..90e2ce767d 100644
--- a/core/src/components/button/test/expand/index.html
+++ b/core/src/components/button/test/expand/index.html
@@ -23,6 +23,14 @@
+
+