diff --git a/public/assets/styles.css b/public/assets/styles.css
index d0cf731..e392f98 100644
--- a/public/assets/styles.css
+++ b/public/assets/styles.css
@@ -29,6 +29,7 @@ table.bf-grid button[data-zone="bravo"] { outline: 3px solid #0c0; }
 .bf-unit { width: 100%; height: 100%; font-size: 0.7rem; border: 0; cursor: pointer; }
 .bf-unit--alpha { background: #cce5ff; }
 .bf-unit--bravo { background: #ffcccc; }
+.bf-unit--active { outline: 2px solid #060; }
 .bf-unit--inactive { opacity: 0.4; cursor: not-allowed; }
 .bf-unit--winner { outline: 3px solid #c00; }
 .bf-action--active { font-weight: bold; }