<style>
.logo{
    width:700px;
    transition:0.8s ease;
    filter:drop-shadow(0 0 5px rgba(0,170,255,.3));
}

.logo:hover{
    filter:
    drop-shadow(0 0 8px #00aaff)
    drop-shadow(0 0 18px #00d5ff)
    drop-shadow(0 0 35px rgba(0,213,255,.6));
}
</style>

<img class="logo" src="logo.png">