Change the trash link when deleting a form, also changing the format of the input into a button. And few inline styles.

gfroms-examples.php

function modify_gfroms_trash_link() {
	return '<button style="background: red; color: white; border: none;" class="submitdelete" title="' . __( 'Move this form to the trash', 'gravityforms' ) . '" onclick="if(confirm(\'' . __( "Would you like to move this form to the trash? \'Cancel\' to stop. \'OK\' to continue", 'gravityforms' ) . '\')){ gf_vars.isFormTrash = true; jQuery(\'#form_trash\')[0].submit();} else{return false;}">' . __( 'Trash', 'gravityforms' ) . '</button>';

}
add_filter('gform_form_trash_link', 'modify_gfroms_trash_link');