app/css/style.css


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html, body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
}

.wrapper {
    display: table;
    width: 100%;
    height: 100%;
}

.content {
    display: table-cell;
    width: 100%;
    height: 100%;
    text-align: center;
    vertical-align: middle;
}

pre {
    margin: auto;
    text-align: left;
    width: 400px;
}