Thanks for the wait ??
With Simple Custom CSS installed, go to Appearance > Custom CSS and insert the following to change the header, main menu and responsive menu colors:
/* Header */
.site-header {
background: #fff;
}
/* Main Navigation */
.main-navigation ul li:hover > a {
color: #0896fe;
}
.main-navigation ul ul {
border-top: 3px solid #0896fe;
}
.main-navigation ul ul li:hover > a {
background: #0896fe;
}
.main-navigation ul ul .current_page_item > a,
.main-navigation ul ul .current-menu-item > a,
.main-navigation ul ul .current_page_ancestor > a {
color: #0896fe;
}
.main-navigation .current_page_item > a,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_ancestor > a {
color: #0896fe;
}
.main-navigation div > ul > li > a:hover {
border-bottom: 3px solid #0896fe;
}
.main-navigation .menu-search .search-icon:hover:before {
color: #0896fe;
}
.main-navigation .menu-search .searchform input[name=s] {
border-top: 3px solid #0896fe;
}
/* Responsive Navigation */
.responsive-menu .main-navigation.toggled ul li a:hover {
background: #0896fe;
}
.responsive-menu .main-navigation.toggled ul ul li a:hover {
background: #0896fe;
}
Hope that helps.