Some tweaks

* Polished image uploading style on offer creation page
* Changed dark bootstrap theme to be more like light one in form
Revert "Some tweaks"

This reverts commit bc63fb8c9aa8fcaee088f5e9c842038d04c134fb.
Revert "Revert "Some tweaks""

This reverts commit 143402ab8a7c20468c48a70e02058edf716fc209.
Some more tweaks

Changed uploading style of avatar to de like one of offer images.