@charset "UTF-8";

body {
    font-family: "Courier New", Courier, monospace;
    background-color: #000000;
    color: #00ff00;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

.center {
    height: 400px;
    position: relative;
    /* border: 3px solid green; */
}

.center pre {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.content {
    width: 50%;
    /* or some other value */
    margin: auto;
    /* other styles */
}

@-moz-document url-prefix() {
    body {
        height: 99%
    }
}