Refactor the Layout challenge

I'm stuck on the first question of this challenge, while following along with Nick, I'm not quite clear where the code is going wrong.

"Inside the media query, select the list items inside the gallery and add a width of 28.3333%."

But I continue to get the error: "Bummer! Be sure to set the width of gallery list items to 28.3333% when the browser is wider than 480px."

Below is the code I enter from the responsive.css file but i continue to get the error. I've tried multiple variations, including placing the main.css into the challenge workspace but still get the error. Any suggestions?

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

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

#primary { width: 50%; float: left; } #secondary { width: 40%; float: right; }

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

#gallery li { width: 28.3333%; } #gallery li:nth-child(4n) { clear: left; }

/******************** PAGE: ABOUT ******************/

.profile-photo { float: left; margin: 0 5% 80px 0; }
}

@media screen and (min-width: 660px) {

/******************** HEADER ******************/ nav { background: none; float: right; font-size: 1.125em; margin-right: 5%; text-align: right; width: 45%; }

#logo { float: left; margin-left: 5%; text-align: left; width: 45%; }

h1 { font-size: 2.5em; }

h2 { font-size: 0.825em; margin-bottom: 20px; }

header{ border-bottom: 5px solid #599a68; margin-bottom: 60px; } }