I want to make my tabs to look like this.

I wanna do a 2x changes to my forum but i need your help.
My tabs are in this style:




But i wanna make them to look like nulledbb i mean not same but simular because i use MyTabs plugin and its default idk how to change the style.

Second thing i wanna change the postbit template to be in horizontal and to have some good look, just that two changes i need to do to make my forum greater. Thank you