Your site is looking nice. Replace this CSS
.home-banner .hb-content-wrap h1,
.home-banner .hb-content-wrap h2,
.home-banner .hb-content-wrap h3,
.home-banner .hb-content-wrap h4,
.home-banner .hb-content-wrap h5,
.home-banner .hb-content-wrap h6,
.home-banner .hb-content-wrap p,
.home-banner .hb-content-wrap textwidget,
.home-banner .button {
color: #fff;
}With
.home-banner .hb-content-wrap h1,
.home-banner .hb-content-wrap h2,
.home-banner .hb-content-wrap h4,
.home-banner .hb-content-wrap h5,
.home-banner .hb-content-wrap h6,
.home-banner .hb-content-wrap p,
.home-banner .hb-content-wrap textwidget,
.home-banner .button {
color: #fff;
}Now I am changing the Color of h3 tag only
.home-banner .hb-content-wrap h3 {
color: #444;
}You can also change the color of specific banner widget like this way:
#home-banner-3.home-banner .hb-content-wrap h3 {
color: #4bc1b6;
}