.melt-wave {
    position: relative;
}
.melt-wave::before {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    transition: 0.2s;
    background: #fff;
    opacity: 0;
}
.melt-wave:active::before {
    opacity: 0.2;
}
.melt-wave::after {
    content: "";
    display: block;
    position: absolute;
    width: 200%;
    height: 100%;
    left: var(--x, 0);
    top: var(--y, 0);
    background-image: radial-gradient(circle, #fff 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: translate(-50%, -50%) scale(10);
    opacity: 0;
    transition: transform 0.8s, opacity 0.8s;
}
.melt-wave:active::after {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0.3;
    transition: 0s;
}