body {
    background: black;
    color: white;
    font-family: Georgia, serif;
    padding: 40px;
}

p {
    margin: 10px 0;
}

.flash {
    animation: lightning 1s infinite;
}

@keyframes lightning {
    0% {
        color: white;
    }

    40% {
        color: yellow;
    }

    50% {
        color: white;
    }

    100% {
        color: white;
    }
}