Add image-hover for social icons in header.php

Hey!
How can I add an image-hover in the current header.php?

div class="head-socials">
					<ul>
						<?php
							$socials = array('facebook','twitter','instagram','pinterest','bloglovin','rss');
							for($i=0;$i<count($socials);$i++){
								$url = '';
								$s = $socials[$i];
								$url = dess_setting('dess_'.$s);
								echo ($url != '' ? '<li><a target="_blank" href="'.$url.'"><img src="'.esc_url( get_stylesheet_directory_uri() ).'/images/'.$s.'-icon.png" alt="'.$s.'" /></a></li>':'');
							}
						?>
					</ul>

Thanks!!!