body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgb(17, 17, 17);
}

.heart {
    height: 70px;
    width: 70px;
    background: red;
    position: relative;
    transform: rotate(-45deg);
    box-shadow: -10px 10px 90px red;
    animation: heartbeat 0.7s linear infinite;
}

.heart:before {
    content: '';
    position: absolute;
    height: 70px;
    width: 70px;
    background: red;
    top: -50%;
    border-radius: 50px;
    box-shadow: -10px -10px 90px red;
}

.heart:after {
    content: '';
    position: absolute;
    height: 70px;
    width: 70px;
    background: red;
    right: -50%;
    border-radius: 50px;
    box-shadow: 10px 10px 90px red;
}

@keyframes heartbeat {
    0% {
        transform: rotate(-45deg) scale(1.1);
    }
    80% {
        transform: rotate(-45deg) scale(0.9);
    }
    100% {
        transform: rotate(-45deg) scale(0.8);
    }
}