diff --git a/src/styles/_summary.scss b/src/styles/_summary.scss
index 4705dba..1e9757f 100644
--- a/src/styles/_summary.scss
+++ b/src/styles/_summary.scss
@@ -217,13 +217,16 @@
     .h5p-interactive-book-summary-submit {
       background-color: #0E7C57;
       color: #ffffff;
-      border: 1px solid #0E7C57;
+      border: 4px solid #0E7C57;
       transition: background-color 150ms;
 
       &:hover {
         background-color: #0c694a;
       }
     }
+    .h5p-interactive-book-summary-submit:focus-visible {
+      border: 4px solid #FFF;
+    }
 
     .h5p-interactive-book-summary-restart {
       color: #757575;