In the Storefront theme, you’ll see a purple box momentarily displayed when menu items and some other elements are selected. To remove the box, use this CSS code:

a:focus, button:focus, .button.alt:focus, input:focus, textarea:focus, input[type=”button”]:focus, input[type=”reset”]:focus, input[type=”submit”]:focus, input[type=”email”]:focus, input[type=”tel”]:focus, input[type=”url”]:focus, input[type=”password”]:focus, input[type=”search”]:focus {
outline-color: transparent;
}