Electro - add Line social icon in footer

functions.php

add_filter( 'electro_set_social_networks', 'ec_child_add_icon', 90 );

function ec_child_add_icon( $args ) {
	$args['line'] = array(
		'label' => 'line',
		'icon'  => 'fab fa-line',
		'id'    => 'line_link',
		'link'  => 'https://at.line.me/'
	);

	return $args;
}

style.css

.footer-social-icons .social-icons .fa-line:hover {
    color: green;
}