[BUG] no proper hover effect on button

**Describe the bug**
in hovering submit button it width becomes very large exceeding its limit

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'donate animal'
2. Scroll down to 'bottom'
3. hover on 'submit button'
4. See error

**Expected behavior**
only button should be scaled not it width on hovering it size should not
increase but not only width.

**Screenshots**

**Desktop (please complete the following information):**
- OS: windows
- Browser chrome
- Version 22

**Additional context**
Add any other context about the problem here.