Add max-width

src/gui/css/mainStyleSheet.tw

@@ -249,6 +249,7 @@ span.zeroButton > a:hover { text-decoration: none; }
 div.output{
 width: 100%;
 width: 100vw;
+max-width: 100%;
 word-break: break-all;
 white-space: normal;
 }