Hi,

Please go to Appearance → Customize → Custom CSS then add the following custom CSS code:

body.search-results .penci-featured-infor .cat a.penci-cat-name,
body.search-results .penci-grid .cat a.penci-cat-name,
body.search-results .penci-masonry .cat a.penci-cat-name,
body.search-results .penci-featured-infor .cat a.penci-cat-name {
    color: blue;
}
body.search-results .header-standard:after {
    background-color: blue;
}
body.search-results .standard-content .penci-more-link a.more-link,
body.search-results .standard-content .penci-more-link.penci-more-link-button a.more-link {
    color: blue;
}

Regards,
PenciDesign.