The color and logo for the admin login page can be changed in \wp-content\themes\wprentals\word_remove.php

To change the background color, you need to replace the color codes

body.login {
background: linear-gradient(43deg, rgba(20,28,21,1) 0%, rgba(184, 129 ,253,1) 100%);
}

To change the logo, you need to change the logo URL

function wpestate_login_logo_url() {
return esc_url( home_url('/') );
}
add_filter( 'login_headerurl', 'wpestate_login_logo_url' );