diff --git a/app/assets/stylesheets/components/_shoutbox.scss b/app/assets/stylesheets/components/_shoutbox.scss
index 02ce178..b749092 100644
--- a/app/assets/stylesheets/components/_shoutbox.scss
+++ b/app/assets/stylesheets/components/_shoutbox.scss
@@ -39,6 +39,8 @@
     display: table-cell;
 
     .contents {
+      word-wrap: break-word;
+      word-break: break-all;
       position: relative;
       display: block;
       padding: 0 10px;