Hi there,
Thanks for writing in! To remove the outlined block style, please add the following code in your Customizer via Appearance > Customize > Custom > CSS:
a:focus, select:focus, input[type="file"]:focus, input[type="radio"]:focus, input[type="submit"]:focus, input[type="checkbox"]:focus {
outline: none !important;
}
Let us know how this goes!