W3Schools is a resource for learning more about using CSS.
ColorPicker.com is a free online color picker tool for generating hex color values that you can use in your CSS styles. In addition to picking colors, you can generate complementary color palettes with the click of a button.
CSS Mate generates standard CSS code from properties and values that you enter.
CSS3 Maker generates CSS3 code from selections and shows which browsers are compliant.
array( // on allow a tags
'href' => array() // and those anchors can only have href attribute
)
);
// make sure your data is set
if( isset( $_POST['asv_meta_box_text'] ) )
update_post_meta( $post_id, 'asv_meta_box_text', wp_kses( $_POST['asv_meta_box_text'], $allowed ) );
}