RWD background added to .wrapper
class so you need to change it in here :
/* ============================================ *
* Global
* ============================================ */
html,
body {
height: 100%;
}
.wrapper {
min-width: 320px;
min-height: 100%;
margin: 0 auto;
background: #FFFFFF;
}
.wrapper:after {
content: '';
display: table;
clear: both;
}
The header links are :
/* -------------------------------------------- *
* Skip - Link
*/
.skip-link {
position: relative;
float: left;
width: 20%;
height: 44px;
background: #FFFFFF;
color: #636363;
line-height: 42px;
text-align: center;
}
And the search add background to #search or if you want to change the background for all inputs add it to .input-text
Anther advice if you are on Chrome you can hover on the element you want to change, right click and select inspect element. I use firebug on firefox.