html {
    height: 100%;
    background-color: black;
    color: white;
}

body {
    margin: 0 auto;
    min-height: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.indexMain {
    flex-grow: 1;
    display: flex;
    align-items: center;
    height: 100%;
}

pre {
    min-width: 200px;
}

.blinkClass {
    animation: blink 1s steps(1, end) infinite;
}

@keyframes blink {
    0%{
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
}

.preSpan {
    display: inline-block;
    margin: 2px;
}

.link {
    text-align: center;
    text-decoration: none;
    color: white;
}

.link:hover {
    background-color: white;
    color: black;
}

.link:hover::after {
    content: ' ← ';
    background-color: black;
    color: white;
}

.link:focus{
    background-color: white;
    color: black;
    outline: none;
}

.link:focus::after {
    content: ' ← ';
    background-color: black;
    color: white;
}