Display language switcher php code as a dropdown list

I am using the code below. I put it in my site header and it is working fine for me.
<?php pll_the_languages( array( ‘dropdown’ => 1 ) ); ?>

Is there a way to change the field background color? By default the field input background color is white, I would like to change the color so that it will match well with my site’s header. I tried something like these and they did not work (I’m not good at coding at all):

<div class=”poly”><?php pll_the_languages( array( ‘dropdown’ => 1 ) ); ?></div>
<p class=”poly”><?php pll_the_languages( array( ‘dropdown’ => 1 ) ); ?></p>
.poly {background-color:green;}

Is there a way to do this?
Thank you