<!DOCTYPE html>
<style>
img {
    background: rgb(0,255,0);
    width: 50px;
    height: 25px;
    margin-bottom: 25px;
    box-shadow: 0px 25px rgb(0,255,0); 
}
div {
    display: inline-block;
    background: red;
    height: 50px;
}
</style>
<div><img src="resources/green-alpha.png"></div>
<div><img src="resources/green.png"></div>
<div><img src="resources/green.jpg"></div>
<div><img src="resources/green.svg"></div>