How do I turn off notices and warnings? I am developing a site and am getting a few warning messages that cover the page. I want to deal with them later and turn them off for now so I can concentrate on theming.

I've tried going to Config>>Development>>Logging and turning them off from there, but although it says the save was successful refreshing the pages shows the 'All Messages' option is still selected and the messages still appear on the front end.

I searched how to do this in Drush and tried drush vset -y error_level 0 and drush vset error_level 0 and got the response "error_level was set to 0." but this too had no affect.

I've tried clearning my cache after each attempt as well.

Would anyone know how to achieve this?
If you don't want to add CSS you can comment out the $messages variable in your page.tpl.php file while you are developing.