2 problems: no margin between contact info paragraphs and edge of browser and images will not go to 3 columns!

I have had a look and as far as i'm aware my code matches what has been written here.

Firstly, there is no space between my text and the edge of the browser on my contact page. If it is desktop size it is fine but once the screen size is reduced it goes.

css for contact page:

.contact-info { list-style: none; padding: 0; margin: 0; font-size: 0.9em; }

.contact-info a { display: block; min-height: 20px; background-repeat: no-repeat; background-size: 20px 20px; padding: 0 0 0 30px; margin: 0 0 10px; }

.contact-info li.phone a { background-image: url('../img/phone.png'); }

.contact-info li.mail a { background-image: url('../img/mail.png'); }

.contact-info li.twitter a { background-image: url('../img/twitter.png'); }

responsive css for contact page:

@media screen and (min-width: 480px) {

/********************* TWO COLUMN LAYOUT *********************/

#primary { width: 50%; float: left; }

#secondary { width: 40%; float: right; }

Secondly, I cant get my images on portfolio page to go into 3 columns. Not sure why (I have tried to code correction which hasnt worked)

responsive css for portfolio:

/********************* PAGE: PORTFOLIO *********************/

#gallery li { width: 28.3333%; }

#gallery li:nth-child(4n) { clear: left; }

}

It is both probably something really stupid but it is driving me INSANE trying to work this out.

Thanks