Field size not shown

See this page for more info https://contactform7.com/text-fields/
Something like [email* your-email maxlength:30]

ok Thanks,so, instead being in the popup menu, you have to write it.

Another related question:
by default, it applies me a size of 40, but, how can i turn it into responsive, i mean 100% width of the container. I try via css but nothing, it applies me 40.