Magento - Change Price Color

 in styles.css

about line 806

/* Old price */
.old-price { margin:0; }
.old-price .price-label { font-size:12px; font-weight:bold; white-space:nowrap; }
/*.old-price .price { font-weight:bold; font-size:13px; color:#396f00; text-decoration:line-through; }*/
.old-price .price {
    font-weight:bold;
    font-size:13px;
    color:#333;
    text-decoration:line-through;
}



/* Special price */
.special-price { margin:0; }
.special-price .price-label { font-size:11px; font-weight:bold; text-transform:uppercase; white-space:nowrap; color:#000; }
.special-price .price {
    font-size:13px;
    font-weight:bold;
    color: #C00;
}