diff --git a/static/bootstrap/stylesheets/bootstrap/mixins/_resize.scss b/static/bootstrap/stylesheets/bootstrap/mixins/_resize.scss
new file mode 100644
index 0000000000000000000000000000000000000000..83fa6379179cba67dbd3b3fb1b1d167380f361d4
--- /dev/null
+++ b/static/bootstrap/stylesheets/bootstrap/mixins/_resize.scss
@@ -0,0 +1,6 @@
+// Resize anything
+
+@mixin resizable($direction) {
+  resize: $direction; // Options: horizontal, vertical, both
+  overflow: auto; // Per CSS3 UI, `resize` only applies when `overflow` isn't `visible`
+}