Fix unusual space between conversation box and input text field

[anubhavp28]

I'm submitting a ... (check one with "x")

• [x] bug report
• [ ] feature request
• [ ] support request => Please do not submit support requests here, instead ask your query in out Gitter channel at https://gitter.im/fossasia/susi_server

Current behavior:

Currently, there is unusual amount of vertical space between the conversation box/area and the input text field.

Expected behavior:

Would you like to work on the issue? Yes