HI!

You can control all the colors of timeline on this page via css in the custom css field of the page.

Or with next css:

.blog-style-timeline .post-title a,
.blog-style-timeline .entry-title.title-h4 a {
    color: #ffffff ;
}
.blog-style-timeline_new.blog-style-timeline article.left-position .wrap-style-right,
.blog-style-timeline .wrap-style{ 
    fill: #2c2e3d; 
    stroke: #2c2e3d;}
.blog-style-timeline .post-title a{ 
    color: #fff;
}
.blog-style-timeline .post-item .summary{ 
    color: #99a9b5;
}
.blog-style-timeline .post-footer-sharing .gem-button {
    background-color: #5f727f;
}
.blog-style-timeline .post-footer-sharing .gem-button:hover {
    background-color: #3c3950;
    
}
body .timeline_new-wrapper .timeline-new-line {
    background: #00bcd4;
    
}
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer-right, 
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer{
    box-shadow: 0 0 0 3px #00bcd4; 
    background: #212331; 
    border-color: #2c2e3d;
}
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer-right:hover,
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer:hover{ 
    background:#fff; 
    
}
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .timeline-date-title, 
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .timeline-date-title-right{
    border-color:#00bcd4; 
    color:#46485c;
    background:#212331;
}
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer-right > div .time, 
body .blog-style-timeline_new.blog-style-timeline article .post-timeline-elements .pointer > div .time{
    color: #00bcd4;
}