opera.css

body {
    /* Three ways to use primary (accent) color */
    color: env(-opera-gx-accent-color);
    /*color: rgb(env(-opera-gx-accent-color-r), env(-opera-gx-accent-color-g), env(-opera-gx-accent-color-b));*/
    /*color: hsl(env(-opera-gx-accent-color-h), env(-opera-gx-accent-color-s), env(-opera-gx-accent-color-l));*/

    /* Three ways to use secondary (background) color */
    background: env(-opera-gx-background-color);
    /*background: rgb(env(-opera-gx-background-color-r), env(-opera-gx-background-color-g), env(-opera-gx-background-color-b));*/
    /*background: hsl(env(-opera-gx-background-color-h), env(-opera-gx-background-color-s), env(-opera-gx-background-color-l));*/
}