How to remove second scroll bar

Hi guys!

Do u know how to remove double scroll from scrollable popup?

U can see it on Service page
https://preview.webflow.com/preview/roaming?preview=7750eb99c3ec3a55e0f97e3490070d02

Click on gold button in right top corner ЗАДАТЬ ВОПРОС

When appears contact form popup there appears second scroll how to disable it?

Thank u very much!

It is nicely done at https://www.quintessentially.com/ when u push “LET’S TALK” button