body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: black;
}

.windows-boot {
    width: 21.5em;
    height: 15em;
    font-size: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.logo p {
    color: white;
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}

.logo .ms {
    font-size: 1.6em;
    font-weight: lighter;
    line-height: 1em;
}

.logo .ms::after {
    content: attr(data-copyright);
    font-size: 0.625em;
    vertical-align: top;
    position: relative;
    top: -0.3em;
    left: 0.2em;
}

.logo .win {
    font-size: 4.2em;
    font-weight: bold;
    line-height: 86%;
}

.logo .win::after {
    content: attr(data-version);
    font-size: 0.5em;
    vertical-align: top;
    position: relative;
    top: -0.4em;
    color: tomato;
}

.logo .pro {
    font-size: 3em;
    font-weight: lighter;
    line-height: 1em;
    padding-left: 0.2em;
}

.bar {
    width: 15em;
    height: 1em;
    border: 0.2em solid silver;
    border-radius: 0.7em;
    position: relative;
    padding: 0.2em;
    overflow: hidden;
}

.bar::before {
    content: '';
    position: absolute;
    width: 3em;
    height: 70%;
    border-radius: 0.2em;
    background: 
        linear-gradient(
            to right,
            transparent 30%,
            black 30%, black 35%,
            transparent 35%, transparent 65%,
            black 65%, black 70%,
            transparent 70%
        ),
        linear-gradient(
            blue 0%,
            royalblue 17%,
            deepskyblue 32%, deepskyblue 45%,
            royalblue 60%,
            blue 100%
        );
    filter: brightness(1.2);
    animation: run 2s linear infinite;
}

@keyframes run {
    from {
        transform: translateX(-3em);
    }

    to {
        transform: translateX(15em);
    }
}