Learn how to always show scrollbars with CSS.
Read on how to do it in this tutorial: https://www.w3schools.com/howto/howto_css_force_scrollbars.asp
How To Force / Always Show Scrollbars
Add overflow: scroll; to show both the horizontal and vertical scrollbar.
Try it yourself here: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_force_scrollbars
Tip: To learn more about the overflow property, go to our CSS Overflow Tutorial or CSS overflow Property Reference.