Change Background Color By Integrating CSS Within PHP

    <?php
    function bphelp_change_background() {
    ?>
    <style type="text/css">
    	div#message-thread div.alt {
		background: #ffffff !important;
	}

    </style>
    <?php
    }
    add_action ('bp_head', 'bphelp_change_background');
    ?>