hr {
    border: 1px solid black;
}

.roundshadow {
    border-radius: 20px;
    filter: drop-shadow(10px 10px 10px #000);
    margin: 15px 15px 30px 15px;
}

.roundshadowlink:hover {
    filter: brightness(1.25) drop-shadow(10px 10px 10px #000);
}