Update tab Css

HI

I use the sap UI5 Tab strip control and I need it to be like following

there is background for all the tabs (this color doesn't mind ) and when You click on some

tab you see black line under the selected tab (in the example the selected tab is Tab2) and the regular tab border will not appear (what you get in the default...)

How can it be done in UI5 ?

Thanks!