How to make selection and bottom line full length?

Question

css

https://jsfiddle.net/8aokLv4e/
how to make it like on the layout?

Answer 1

add to selected class active
with this code

background-color: светлый цвет.
color: white;

And for the elements, the bottom border will look like this
border-bottom: 1px solid #цвет