.button {
    padding-top: 2em;
    border: 2px solid black;
    box-shadow: 3px 3px black;
    width: 70px;
    height: 20px;
    user-select: none;
}

    .button:hover {
        background-color: #DAF5F0;
    }

@keyframes pulse {
    from {
        box-shadow: 3px 3px black;
        margin-top: 0;
        margin-right: 0;
    }

    50% {
        box-shadow: 0px 0px black;
        margin-top: 3px;
        margin-right: 3px;
    }

    to {
        box-shadow: 3px 3px black;
        margin-top: 0;
        margin-right: 0;
    }
}

.button-clicked {
    border: 2px solid black;
    box-shadow: 3px 3px black;
    width: 70px;
    height: 20px;
    position: fixed;
    animation-name: pulse;
    animation-duration: 0.3s;
    user-select: none;
    padding-top: 2em;
}