WordPress custom styles in menu page

You could use

<!doctype html>
<head>
<style type="text/css">
#toplevel_page_custom_menu_title{
display:none !important;
}
.update-nag{
height:auto !important;
}
</style>
</head>
<body>
<div class="update-nag">
<?php
   echo "Admin Page Test";
?>
</div>
</body>
</html>

You can enqueue this way

function prefix_add_my_stylesheet() {
        wp_register_style( 'prefix-style', plugins_url('style.css', __FILE__) );
        wp_enqueue_style( 'prefix-style' );
    }
add_action( 'admin_enqueue_scripts', 'prefix_add_my_stylesheet' );

Reference: http://codex.wordpress.org/Plugin_API/Action_Reference/admin_enqueue_scripts#Example:_Load_CSS_File_on_All_Admin_Pages

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