Hi novelle. I’m not an advocate of trying to change the sidebars since the theme is designed to use fixed-width sidebars. I worked up this css which should get you started on the desktop view. Add this to your chilo theme or custom css:
/* set background on main content areas */
#page .container-inner {
background: none;
}
.main {
background: none !important;
}
.col-3cm .main-inner {
background: transparent;
}
.col-3cm .content {
background: #fff;
}
/* primary sidebar white background, push left, reduce width by margin */
.col-3cm .s1 {
background: #fff;
margin-right: 20px;
width: 320px;
}
/* secondary sidebar white background, reduce width 20px */
.col-3cm .s2 {
background: #fff;
width: 240px;
}
There’s quite a bit more to do to get it to work correctly in responsive mode. Unfortunately I don’t have the time to dig into it that deeply. Hope this helps.