* {
    margin: 0px;
    padding: 0px;
}

html, body {
    height: 100%;
}

body {
    background-color: black;
}

.centered {
    display: flex;
    justify-content: center;
    align-items: center;
}

.horizontal-container > * {
    display: inline-block;
    text-align: center;
}

.vertical-container > * {
    display: block;
}

.full {
    height: 100vh;
}

#dosbox {
    width: 100vw;
    height: 90vh;
}