Size of banner

[Sam_78]

Hi I am about to make a graphic banner for my site so can someone tell me what it the perfect pixel size 1100 * 360 ? or something else?
Also when I add banner I still see blue color on both sides I want my banner to be stretched out end to end so which css do I need to modify?

[Basara]

Do you insert it to slider or regular graphic banner block?
https://abantecart.atlassian.net/wiki/spaces/AD/pages/12320827/Banner+Block
https://abantecart.atlassian.net/wiki/spaces/AD/pages/12582976/Banner+Slider

[Sam_78]

I saw both this videos but its not helping me
So here are my steps
I created a new graphic banner and assigned main top banner group
I turned off all other existing banner which is Main banner 1...5
So now I only have one graphic banner which is on and in Main Banner Top group and in layout that block is turned on
I still don't see that banner infact the whole slider goes off as there is only one graphic banner

Second I added img src to one of the default text banner and got it displayed but then I see blue color on left and right side of banner I want my banner to be stretched across the screen.