Hello There!
Greetings of the day!
Follow the below steps to add custom CSS
1) Please log in to the admin area
2) Go to “Appearance >> Customize >> Additional CSS”.
3) Paste the below code in “Additional CSS”
.mean-container .mean-nav ul#primary-menu {
overflow-y: scroll;
height: 600px;
}
4) Save the updates
Hope this helps.
Feel free to get in touch in case of further queries.
Thanks and Regards,
Team ProDesigns