Hello there,
Please try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.
.widget-area .widget_fp_social a,#mainnav ul li a:hover, .sydney_contact_info_widget span, .roll-team .team-content .name,.roll-team .team-item .team-pop .team-social li:hover a,.roll-infomation li.address:before,.roll-infomation li.phone:before,.roll-infomation li.email:before,.roll-testimonials .name,.roll-button.border,.roll-button:hover,.roll-icon-list .icon i,.roll-icon-list .content h3 a:hover,.roll-icon-box.white .content h3 a,.roll-icon-box .icon i,.roll-icon-box .content h3 a:hover,.switcher-container .switcher-icon a:focus,.go-top:hover,.hentry .meta-post a:hover,#mainnav > ul > li > a.active, #mainnav > ul > li > a:hover, button:hover, input[type="button"]:hover, input[type="reset"]:hover, input[type="submit"]:hover, .text-color, .social-menu-widget a, .social-menu-widget a:hover, .archive .team-social li a, a, h1 a, h2 a, h3 a, h4 a, h5 a, h6 a,.classic-alt .meta-post a,.single .hentry .meta-post a {
color:#fff000 !important;
}
.reply,.woocommerce div.product .woocommerce-tabs ul.tabs li.active,.woocommerce #respond input#submit,.woocommerce a.button,.woocommerce button.button,.woocommerce input.button,.project-filter li a.active, .project-filter li a:hover,.preloader .pre-bounce1, .preloader .pre-bounce2,.roll-team .team-item .team-pop,.roll-progress .progress-animate,.roll-socials li a:hover,.roll-project .project-item .project-pop,.roll-project .project-filter li.active,.roll-project .project-filter li:hover,.roll-button.light:hover,.roll-button.border:hover,.roll-button,.roll-icon-box.white .icon,.owl-theme .owl-controls .owl-page.active span,.owl-theme .owl-controls.clickable .owl-page:hover span,.go-top,.bottom .socials li:hover a,.sidebar .widget:before,.blog-pagination ul li.active,.blog-pagination ul li:hover a,.content-area .hentry:after,.text-slider .maintitle:after,.error-wrap #search-submit:hover,#mainnav .sub-menu li:hover > a,#mainnav ul li ul:after, button, input[type="button"], input[type="reset"], input[type="submit"], .panel-grid-cell .widget-title:after {
background-color:#fff000 !important;
}
.roll-socials li a:hover,.roll-socials li a,.roll-button.light:hover,.roll-button.border,.roll-button,.roll-icon-list .icon,.roll-icon-box .icon,.owl-theme .owl-controls .owl-page span,.comment .comment-detail,.widget-tags .tag-list a:hover,.blog-pagination ul li,.hentry blockquote,.error-wrap #search-submit:hover,textarea:focus,input[type="text"]:focus,input[type="password"]:focus,input[type="datetime"]:focus,input[type="datetime-local"]:focus,input[type="date"]:focus,input[type="month"]:focus,input[type="time"]:focus,input[type="week"]:focus,input[type="number"]:focus,input[type="email"]:focus,input[type="url"]:focus,input[type="search"]:focus,input[type="tel"]:focus,input[type="color"]:focus, button, input[type="button"], input[type="reset"], input[type="submit"], .archive .team-social li a {
border-color:#fff000 !important;
}
Replace #fff000 to the color code of your choice.
Regards,
Kharis