Change header color on AMP mode

/* Change header color on AMP mode */
function add_custom_css_for_amp_mode() {
    ?>
    /* Header Color */
    .amp-wp-header {
        background: linear-gradient(90deg, #3070b5 0%, #006838 100%);
    }

    /* Header Logo */
    .amp-wp-header .jeg_mobile_logo {
        background-image: url(https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Google_2015_logo.svg/368px-Google_2015_logo.svg.png);
    }
    <?php
}
add_action( 'amp_post_template_css', 'add_custom_css_for_amp_mode' );