HTML

box shadow svg css

<img src="https://www.sean-lloyd.com/logo.svg" width="200" class="shadow" />

<style>
.shadow {
  -webkit-filter: drop-shadow( 4px 4px 4px rgba(0, 0, 0, .5));
  filter: drop-shadow( 4px 4px 4px rgba(0, 0, 0, .5));
}
</style>

svg shadow

filter: drop-shadow(3px 3px 5px cyan);