diff --git a/src/styles/_summary.scss b/src/styles/_summary.scss
index 1e9757f..45d8253 100644
--- a/src/styles/_summary.scss
+++ b/src/styles/_summary.scss
@@ -218,10 +218,11 @@
       background-color: #0E7C57;
       color: #ffffff;
       border: 4px solid #0E7C57;
-      transition: background-color 150ms;
+      transition: background-color 150ms, border-color 150ms;
 
       &:hover {
         background-color: #0c694a;
+        border-color: #0c694a;
       }
     }
     .h5p-interactive-book-summary-submit:focus-visible {
@@ -230,7 +231,7 @@
 
     .h5p-interactive-book-summary-restart {
       color: #757575;
-      border: 1px solid #ebebeb;
+      border: 4px solid #ebebeb;
       background-color: #ffffff;
       transition: background-color 150ms;