Hello Sergio,
Ok, Kindly removes the previous CSS code as your given above. Now please add the given below CSS code instead of the previous code. Please go to the Appearance => Customize => Additional CSS then paste the CSS here and click to Publish button.
body.page-template-default .navbar-header-wrap.classic-header.not-sticky,
body.blog .navbar-header-wrap.classic-header.not-sticky {
background-color: #fff;
position: relative;
}
body.page-template-default .navbar-header-wrap.classic-header.not-sticky .nav .menu-item .nav-link,
body.blog .navbar-header-wrap.classic-header.not-sticky .nav .menu-item .nav-link {
color: #061018;
}
body.page-template-default .navbar.navbar-header-wrap.classic-header .nav .menu-item.active .nav-link,
body.page-template-default .navbar.navbar-header-wrap.classic-header .nav .menu-item .nav-link:hover,
body.blog .navbar.navbar-header-wrap.classic-header .nav .menu-item.active .nav-link,
body.blog .navbar.navbar-header-wrap.classic-header .nav .menu-item .nav-link:hover {
color: #fff;
}
body.page-template-default .navbar.navbar-header-wrap.classic-header.not-sticky .navbar-toggler-icon,
body.blog .navbar.navbar-header-wrap.classic-header.not-sticky .navbar-toggler-icon {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='rgba(1, 1, 47, 1)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E") !important;
}
Let us know if it solved the problem.
Thanks