Send button and end chat button looks different

**I'm submitting a ...** 
  - [x] bug report
  - [ ] feature request

**Current behavior:**
![photo6181191322245900434](https://user-images.githubusercontent.com/26284185/37885560-8edd1900-30d3-11e8-96dc-2d3c0c8143b5.jpg)


**Expected behavior:**

Both the buttons should either be rounded or square.