Custom login, footer, remove notification

Working fine with Flatsome Theme

Custom login page

Paste code to function.php in Child theme

Custom login

/**************************
* Custom login admin WP
***************************/
add_action( 'login_enqueue_scripts', 'xsolutions_login_logo' );
function xsolutions_login_logo() {
?>
<style type="text/css">
#login h1 a, .login h1 a {background-image: url(/wp-content/uploads/2020/11/Logo_VNU-HCM-e1632109120322.png);width: 250px;background-size: contain;background-repeat: no-repeat;background-color: transparent;}
#login form#loginform{border-radius: 10px;box-shadow: 0 0 50px rgb(255 255 255 / 24%);background: #ffffff1a;border: 1px solid #d4d4d4;color: #000;}
#login input#wp-submit{background-color:#1F2A37;border:none;}
#login #backtoblog a, #login #nav a {color: #000;}
#login form .input, #login form input[type=checkbox], #login input[type=text],#login form input[type=password]{background: #fff0;border: 1px solid #d4d4d4;color: #000;}
body.login{background: url(/wp-content/uploads/2021/09/bg-login.jpg) center bottom;color:#000;}
#login .button.wp-hide-pw .dashicons {color: #1F2A37;}
</style>
<?php
}
add_filter( 'login_headerurl', 'xsolutions_login_logo_link' );
function xsolutions_login_logo_link( $url ) {return home_url( '/' );}

Demo login page

Custom footer dashboard

Paste code to function.php in Child theme

Custom Footer

/******************************
* Change footer dashborad
******************************/

function remove_footer_admin () {
 echo 'By <a href="https://xsolution.vn" target="_blank">Xsolution.vn</a> © 2020 EJ Vape Sài Gòn | Designed by <a href="https://www.facebook.com/thaikhang.royal" target="_blank">Thái Duy Khang</a></p>';
}
add_filter('admin_footer_text', 'remove_footer_admin');

Demo footer dashboard

Remove copyright, notification dashboard

Paste code to function.php in Child theme

Remove notification

/*****************************************
* Remove Copyright, notification dashboard
******************************************/

add_action('admin_head', 'vf_admin_style');
function vf_admin_style() {
    echo '<style>
    
    /**************** 
    * your css here, example:
    * #adminmenu #menu-plugins .update-plugins, 
    * #wp-admin-bar-updates,
    * .notice, .updated {display:none!important;}
    *******************/
    
      </style>';
}

Remove & Edit WP logo dashboard

//Xoá logo admin bar
function remove_logo_and_submenu() {
    global $wp_admin_bar;
    //the following codes is to remove sub menu
    $wp_admin_bar->remove_menu('about');
    $wp_admin_bar->remove_menu('wporg');
    $wp_admin_bar->remove_menu('documentation');
    $wp_admin_bar->remove_menu('support-forums');
    $wp_admin_bar->remove_menu('feedback');
    //and this is to change wordpress logo
    $wp_admin_bar->add_menu( array(
        'id' => 'wp-logo',
        'title' => '<img src="/wp-content/uploads/2021/01/Asset-5.png" />',
        'href' => __('https://xsolution.vn'),
        'meta' => array(
            'logo' => __('Thiết kế bởi © 2020 Xsolutions.vn'),
            'tabindex' => 1,
        ),
    ));
    echo '
    <style type="text/css">
    #wpadminbar #wp-admin-bar-wp-logo>.ab-item {
    margin: 5px 0px 0px 0!important;
}   
</style>
';
}
add_action( 'wp_before_admin_bar_render', 'remove_logo_and_submenu' );

//Đổi logo trong dashboard
function wpb_custom_logo() {
echo '
<style type="text/css">
#wpadminbar #wp-admin-bar-wp-logo > .ab-item .ab-icon:before {
background-image: url(/wp-content/uploads/2020/05/logo-dashboard2.png) !important;
background-position: 0 0;
color:rgba(0, 0, 0, 0);
}
#wpadminbar #wp-admin-bar-wp-logo.hover > .ab-item .ab-icon {
background-position: 0 0;
}
</style>
';
}
//hook into the administrative header output
add_action('wp_before_admin_bar_render', 'wpb_custom_logo');

Demo