button {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 25px 20px 22px;
    box-shadow: rgba(10, 37, 64, 0.35) 0px -2px 6px 0px inset;
    background-color: #e8e8e8;
    border-color: #ffe2e2;
    border-style: solid;
    border-width: 9px;
    border-radius: 35px;
    font-size: 25px;
    cursor: pointer;
    font-weight: 900;
    color: rgb(134, 124, 124);
    font-family: monospace;
    transition: transform 400ms cubic-bezier(0.68, -0.55, 0.27, 2.5), border-color 400ms ease-in-out, background-color 400ms ease-in-out;
    word-spacing: -2px;
}

@keyframes movingBorders {
    0% {
        border-color: #fce4e4;
    }

    50% {
        border-color: #ffd8d8;
    }

    90% {
        border-color: #fce4e4;
    }
}

button:hover {
    background-color: #eeeeee;
    transform: scale(105%);
    animation: movingBorders 3s infinite;
}

button svg {
    margin-right: 11px;
    fill: rgb(255, 110, 110);
    transition: opacity 100ms ease-in-out;
}

.filled {
    position: absolute;
    opacity: 0;
    top: 20px;
    left: 22px;
}

@keyframes beatingHeart {
    0% {
        transform: scale(1);
    }

    15% {
        transform: scale(1.15);
    }

    30% {
        transform: scale(1);
    }

    45% {
        transform: scale(1.15);
    }

    60% {
        transform: scale(1);
    }
}

button:hover .empty {
    opacity: 0;
}

button:hover .filled {
    opacity: 1;
    animation: beatingHeart 1.2s infinite;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}