I just had a look, the rule I don't think is present but can be created, there are some caveats though, some styles from the Vanilla dmm will need altering if starting from a transparent dmm, as the link styles are white etc and would be invisible, Robert, could paste these in at the very bottom of the p7DMM10 (Vanilla dmm theme) stylesheet.....
.p7DMM10 {background-color: transparent; background:none);}
.p7DMM10.p7dmm-fixed { background-color:#000;}
.p7DMM10 ul a { color: #000;}
.p7DMM10 ul a.trig {background-image: url(img/p7dmm_east_black.gif);}
.p7DMM10 ul a.open.trig {background-image: url(img/p7dmm_south_white.gif);}
.p7DMM10.p7dmm-fixed.p7DMM10 ul a{ color:#fff;}
@media only screen and (min-width: 0px) and (max-width: 700px) {
.p7DMM10 {background-color: #111; background: rgba(0,0,0,.92);}
.p7DMM10 ul a,.p7DMM10 ul ul a {color: #AAA;}
.p7DMM10 ul a.trig {background-image: url(img/p7dmm_east_white.gif);}
}
HTH