CSS Scroll bar colors code in 3.07

[syrus.xl]

Well I tried adding the following code:

/* scroll bars */
.html {
                    scrollbar-arrow-color: #FF9933;
                    scrollbar-3dlight-color: #1194CD;
                    scrollbar-highlight-color: #F6F7F8;
                    scrollbar-face-color: #0099FF;
                    scrollbar-shadow-color: #0099FF;
                    scrollbar-track-color: #FF9933;
                    scrollbar-darkshadow-color: #0853AF;
}

in the Main CSS Style > Additional CSS Definitions and I still cannot get it working. Is this the correct place where this code should go?