diff --git a/static/bootstrap/stylesheets/bootstrap/mixins/_center-block.scss b/static/bootstrap/stylesheets/bootstrap/mixins/_center-block.scss
new file mode 100644
index 0000000000000000000000000000000000000000..e06fb5e276e471ac4bd574068254808089695afd
--- /dev/null
+++ b/static/bootstrap/stylesheets/bootstrap/mixins/_center-block.scss
@@ -0,0 +1,7 @@
+// Center-align a block level element
+
+@mixin center-block() {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}