button or element animation

add class ecomswoo to the element

.btsk{ 
    animation: bshk 1.5s infinite;
}

@keyframes ecomswoo{
    0% {
        box-shadow: 0 0 0 0px rgba(182, 228, 0, 0.64);
    }
    100% {
        box-shadow: 0 0 0 25px rgba(182, 228, 0, 0);
    }
}