UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36

Steps to reproduce the problem:
1. Open some extension option UI in MD extension manager

What is the expected behavior?
If the option UI is much heigher than preset, vertical scroll bar should be displayed for users to scroll down

What went wrong?
no scroll bar displayed

Did this work before? No 

Chrome version: 65.0.3325.146  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

found some code update as below, seems you set dialog-body style to overflow: hidden

commit	08c0cf8984048bc5c40d01fc679c11b97c17e5a5
MD Extensions polish: Update options dialog sizing logic.

after disabled chrome://flags -- "Enable Material Design extensions", it works.
OR
use dev tool to disable this CSS, it also works.

for detail, please check with screenshot
 

	001.jpg 49.2 KB View Download

	002.jpg 67.2 KB View Download

	003.jpg 113 KB View Download