.preloader {
    display: flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
}

.preloader > img {
    width: 7em;
    animation: 1.8s infinite heartbeat;
}

.preloader > p {
    font-size: 1em;
    font-family: sans-serif;
    margin-top: .5em;
    margin: 0.5em 0 0;
}
  
@keyframes heartbeat {
    0% { transform: scale(1); }
    25% { transform: scale(1.05); }
    50% { transform: scale(1); }
    75% { transform: scale(1.05); }
    100% { transform: scale(1); }
}