@keyframes heart {

    0%, 40%, 80%, 100% {
      transform: scale(1);
    }

    20%, 60% {
      transform: scale(1.15);
    }

}

.heart {
    animation: heart 1000ms infinite;
}

/* Buttons */

.md-button {
    border-radius: 100px !important;
}

/* Responsive videos */

.md-typeset video {
    height: auto;
    max-width: 100%;
}