Icon reposition in spoiler

Default position is left – I want those icons on the right side of the spoiler in this site (pass to enter: merat).
In Firebug it works if i do like this:

.su-spoiler-style-default > .su-spoiler-title {
    padding-left: 27px;
    padding-right: 27px;
}

.su-spoiler-style-default > .su-spoiler-title > .su-spoiler-icon {
    right: 0;
}

.su-spoiler-icon {
    display: block;
    font-family: FontAwesome;
    font-size: 14px;
    font-style: normal;
    font-weight: normal;
    height: 20px;
    right: 7px;
    line-height: 21px;
    position: absolute;
    text-align: center;
    top: 7px;
    width: 20px;
}

But when I place this code in my Custom CSS, nothing happens – icons stay on the left.
What am I doing wrong? This is probably not the right way to reposition those icons?
Appreciate any help on this.

http://wordpress.org/plugins/shortcodes-ultimate/