Css Media queries

@media screen and (max-width:799px){
body, #container, #top-menu-container, #header, #header-content, #content-full, .conwidth, #footer, #footer-sidebar, #creditline, #slide-container, #slide, #slide img, img.site-logo, h1.site-title, #heading, .heading-desc{
max-width:100%;min-width:0;
}
body {
padding:0 5px;
}
#slide-container, #slide, #slide img, #header-bottom {
height:auto;
}
#heading {
margin:0 auto 40px;
}
.heading-desc {
clear:both;
}
#featured-boxs {
margin: 0; padding: 20px 10px; width: 100%;
}
#footer-content {
width: 95%;
}
#right-sidebar, #simplify-main-menu {
clear:both;
float:none;
margin:0 auto;
width:100%;
}
.featured-box-first {
margin: 0 0 20px 0px
}
#featured-boxs img.box-image {
clear:both;
display:block;
margin-bottom:10px;
}
#design-main-menu, #content {
float:none;
width:100%;
}
#footer-sidebar #footer-widget, #footer-sidebar #first-footer-widget, #right-sidebar .widget {
min-width: 200px;
float: left;
margin-left: 15px;
}
#client {
width: 100%;
display: block;
}
.simply-scroll {
width: 95%;
margin: 0 auto;
}
.postmetadata, .postmetadata:hover {
max-width:70%;
}
img.site-logo {
display: block;
float: none;
margin: 0 auto;
}
#featured-boxs img.box-icon {
clear: both;
display: block;
}
h3.featured-box2 {
float: left;
max-width:100%;
}
#piecemaker, #slide-container {
display: none;
}
#simplify-main-menu a {
color: #333333;
}
@media screen and (max-width:599px) {
#social {
display: none;
}
}
@media screen and (max-width:499px) {
#simplify-main-menu {
float: left;
}
#simplify-main-menu ul {
margin: 0 auto;
}
#simplify-main-menu ul ul ul
{
left: 15px;
top: 20px;
}
#simplify-main-menu a {
margin: 0 auto;
border-bottom: 3px solid #FFFFFF;
padding: 10px;
background: #EEEEEE;
width: 100%;
}
#simplify-main-menu li {
float: none;
width: 220px;
margin: 0 auto;
}
#simplify-main-menu ul ul a {
margin: 0 auto;
width: 90%;
padding: 9px 5%;
}
}