div.pub_id.doi, 
.obj_article_summary .pub_id.doi, 
.obj_issue_toc .pub_id.doi, 
.item.doi,
.pub_id.doi {
    color: #FF0000 !important;
}

div.pub_id.doi a, 
.obj_article_summary .pub_id.doi a, 
.obj_issue_toc .pub_id.doi a, 
.item.doi a,
.pub_id.doi a {
    color: #0000FF !important;
    text-decoration: underline !important;
}