Break in middle of word if a span within parallel view

app/assets/stylesheets/pages/diff.scss

@@ -131,8 +131,13 @@
       margin: 0;
       padding: 0 0.5em;
       border: none;
+
       &.parallel {
         display: table-cell;
+
+        span {
+          word-break: break-all;
+        }
       }
     }