php and css, need help please

I need some help about how to fix the width and height in css using php code

<style>
#cont{width:<?php 40+(3*$thumbs_width);?>px;margin:0 auto;background:#ffffff;text-align:left;padding:10px}
.mask1{position:relative;width:<?php 3*$thumbs_width;?>px;height:<?php 2*$thumbs_height ?>px;overflow:hidden;}
</style>


any help would be wellcome and thanks in advance

 

<style>
#cont{width:<?php echo 40+(3*$thumbs_width);?>px;margin:0 auto;background:#ffffff;text-align:left;padding:10px}
.mask1{position:relative;width:<?php echo 3*$thumbs_width;?>px;height:<?php echo 2*$thumbs_height ?>px;overflow:hidden;}
</style>

PHP:

 

this should be like this:

<style>
#cont{width:<?php echo 40+(3*$thumbs_width);?>px;margin:0 auto;background:#ffffff;text-align:left;padding:10px}
.mask1{position:relative;width:<?php echo 3*$thumbs_width;?>px;height:<?php 2*$thumbs_height ?>px;overflow:hidden;}
</style>

PHP:

you didn't used echo

 

thanks to all of you, now it was fixed

 

Your Welcome We Are Always Here To Help

 

<?= ?>
could be also if your shorttags are open normally <?php echo ?> thing old odd thing

 

yes this can be done like that as well.

 <style>
#cont{width:<?=40+(3*$thumbs_width);?>px;margin:0 auto;background:#ffffff;text-align:left;padding:10px}
.mask1{position:relative;width:<?=3*$thumbs_width;?>px;height:<?=2*$thumbs_height ?>px;overflow:hidden;}
</style>

PHP: