(bug): Add button overlaps members in portrait mode
### Summary
(Summarize the bug encountered concisely)
### Steps to reproduce
1. Go to a group.
### Platform information
HUAWEI (HUAWEI ANE-LX1) / Android 8.0.0
Environment: Huawei P20 Lite Chrome
### App version
January 16 / 1
### What is the current *bug* behavior?
In portrait mode, add button "+" overlaps with members avatars.
### What is the expected *correct* behavior?
Page should be displayed properly
### Relevant logs and/or screenshots
### Possible fixes
(If you can, link to the line of code that might be responsible for the problem)
issue