diff --git a/styles/ex-mode.less b/styles/ex-mode.less
index da5d1df..fea8230 100644
--- a/styles/ex-mode.less
+++ b/styles/ex-mode.less
@@ -6,3 +6,7 @@
 
 .ex-mode {
 }
+
+div[is=ex-command-mode-input] atom-text-editor[mini]::before {
+  content: ":";
+}