Vertical scroll bar disappears on product page in Dawn theme

[Michael157]

Hi, I have been experiencing issues with disappearing vertical scroll bar on the product page mainly when browsing the website on desktop. My store link is https://utopiaclouds.com

I am using the Dawn theme, and I recently updated to the latest version 15.3.0 and the problem has increased after the update. It's mostly on products that have variants (one variant with many options e.g. Flavor with 20 to 30 different options). It doesn't occur every time a product page is visited. When it happens the scroll bar disappears in google chrome or edge and when refreshing the page, it appears again. 

There are many posts about scrolling bugs in the Dawn theme, but I couldn't find any solution to my problem. Can you help fix this problem. 

[TheScriptFlow_]

Paste this code in the end of base.css file.

body {
    overflow-y: scroll !important;
}

[Michael157]

I will monitor if it occurs again. Thank you for your prompt response.