Why are we using css

Answer 1

I know right? 90s/80s nostalgia is on the rise, so lets have the horrible website design from back then with no css!

Answer 2

for styling our web pages!!

Answer 3

Intro PHP: http://www.w3schools.com/php/
HTML and CSS normally runs on the end-users browsers, hence the name client side scripting; PHP is considered as server-side scripting because it runs on the servers. Sometimes, you might want to show static contents using HTML and uses PHP to process dynamic contents (eg. Calculation of tax income).