Replace this link ‘https://wpsnippet.club/wp-content/uploads/2023/05/wpsnippetclub-logo.png’ with the url of your custom logo, and upload it to your sites media.
function custom_login_page_logo() { ?>
<style type="text/css">
#login h1 a, .login h1 a {
background-image: url(https://wpsnippet.club/wp-content/uploads/2023/05/wpsnippetclub-logo.png);
height:65px;
width:320px;
background-size: 320px 65px;
background-repeat: no-repeat;
background-size: contain !important;
padding-bottom: 30px;
}
</style>
<?php }
add_action( 'login_enqueue_scripts', 'custom_login_page_logo' );