diff --git a/core/themes/bartik/config/bartik.breakpoints.yml b/core/themes/bartik/config/bartik.breakpoints.yml
new file mode 100644
index 0000000..9eb9cb2
--- /dev/null
+++ b/core/themes/bartik/config/bartik.breakpoints.yml
@@ -0,0 +1,3 @@
+mobile: '(min-width: 0px)'
+narrow: 'all and (min-width: 560px) and (max-width:850px)'
+wide: 'all and (min-width: 851px)'
diff --git a/core/themes/seven/config/seven.breakpoints.yml b/core/themes/seven/config/seven.breakpoints.yml
new file mode 100644
index 0000000..9fd82d7
--- /dev/null
+++ b/core/themes/seven/config/seven.breakpoints.yml
@@ -0,0 +1,2 @@
+mobile: '(min-width: 0em)'
+wide: 'screen and (min-width: 40em)'
diff --git a/core/themes/stark/config/stark.breakpoints.yml b/core/themes/stark/config/stark.breakpoints.yml
new file mode 100644
index 0000000..e2eb626
--- /dev/null
+++ b/core/themes/stark/config/stark.breakpoints.yml
@@ -0,0 +1,3 @@
+mobile: '(min-width: 0px)'
+narrow: 'all and (min-width: 480px) and (max-width: 959px)'
+wide: 'all and (min-width: 960px)'