new changes to Login button and SearchBar

[shatanshu3006]

closes issue number #22

1. Adding border radius
2. Adding Hover effect
3. Adding a transition effect
4. The button goes a little darker and floats on hovering
5. Tooltips (hovering tip)
6. Similar hovering and Tooltips effect on Search Icon and Search Bar (with the same color changes [little darker])
7. Reduced the length of SearchBar
8. Aligned SearcBar,Search Icon and Login button with the Title of the Page ("Open Source Galaxy")
9. Faded the Placeholder and reduced the width
10. Fade in animation for all three upon loading

Before:

After:

[Rupa-Rd]

Will it show any tooltips if I hover over it?

[shatanshu3006]

Will it show any tooltips if I hover over it?

Yes all the three :

[Rupa-Rd]

Mention the issue number its closing, like 'closes #issuenumber'

[shatanshu3006]

Mention the issue number its closing, like 'closes #issuenumber'

Done!