[box] Text [/box]

<div class="box">&nbsp; Text &nbsp;</div>

function infoButton($atts, $content = null) {
     extract( shortcode_atts( array(

    'class' => '',

    ), $atts ));

    $str = '<div class="box ' . $class . '">' . do_shortcode($content) . '</div>';
    $new_str = str_replace('&nbsp;','',$str);

    return $new_str;

    }
    add_shortcode('box', 'infoButton');

function infoButton($atts, $content = null) {
     extract( shortcode_atts( array(

    'class' => '',

    ), $atts ));

    $str = '<div class="box ' . $class . '">' . do_shortcode( trim( $content ) ) . '</div>';

    return $str;

}
add_shortcode('box', 'infoButton');