Reply To: Help needed on CSS and some font change

Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

body .wd-nav.wd-style-underline .nav-link-text:after{
	background-color:red;
}
body .wd-header-my-account .wd-tools-element .wd-tools-text {
    font-size: 20px;
}

Alternativly, you can use this selector in the Advanced typography as the custom selector:
body .wd-header-my-account .wd-tools-element .wd-tools-text

Best Regards