:root {
    --number-of-characters: 21;
}

body {
    font-family: 'Roboto Mono', monospace;
    display: -ms-grid;
    display: grid;
    place-content: center;
    height: 100vh;
}

h1 {
    position: relative;
    display: inline-block;
}

h1::before,
h1::after {
    position: absolute;
    content: '';
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

h1::before {
    background: white;
    opacity: 1;
    -webkit-animation: typewriter 4s steps(var(--number-of-characters)) 2s forwards;
    animation: typewriter 4s steps(var(--number-of-characters)) 2s forwards;
}

h1::after {
    width: 3px;
    background: black;
    -webkit-animation: typewriter 4s steps(var(--number-of-characters)) 2s forwards,
        blink 1.3s steps(var(--number-of-characters)) infinite;
    animation: typewriter 4s steps(var(--number-of-characters)) 2s forwards,
        blink 1.3s steps(var(--number-of-characters)) infinite;
}

@-webkit-keyframes typewriter {
    to {
        left: 100%;
    }
}

@keyframes typewriter {
    to {
        left: 100%;
    }
}

@-webkit-keyframes blink {
    0% {
        background: black;
    }

    49% {
        background: black;
    }

    50% {
        background: transparent;
    }

    100% {
        background: transparent;
    }
}

@keyframes blink {
    0% {
        background: black;
    }

    49% {
        background: black;
    }

    50% {
        background: transparent;
    }

    100% {
        background: transparent;
    }
}

.odkaz {
    font-size: 30px;
    color: black;
    position: absolute;
    text-align: center;
}