body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100svh;
    margin: 0;
    padding: 0;
    font-size: 2em;
    background-color: #181818;
    color: white;
}

pre {
    margin: 0;
}

a {
    position: absolute;
    top: 1em;
    left: 1em;
    border: 1px solid white;
    background-color: black;
    color: white;
    font-size: 1em;
    letter-spacing: .1em;
    transition: border .2s linear, background-color .2s linear, color .2s linear;
    text-decoration: none;
    padding: .4em 1em;
}

a:hover {
    border: 1px solid black;
    color: black;
    background-color: white;
}

.blink {
    animation: pulse .6s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

@media screen and (max-width: 480px) {

    body {
        font-size: 1.2em;
    }

    a {
        top: auto;
        left: auto;
        bottom: 10vh;
        right: 1em;
    }
}