[BUGFIX] Add padding-top to nav

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
[BUGFIX] nav - add margin-right between icon and text

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
[BUGFIX] nav - add padding-left

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
Remove unused nav styles

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
[BUGFIX] nav - add margin-bottom

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>