index.css

body {
    margin: 0;
    font-family: sans-serif;
}

#root {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0, 0, 0, 1);
}

#portrait {
    position: relative;
    margin: auto;
    min-width: 300px;
    min-height: 300px;
    width: 100%;
    height: 100%;
    max-width: 62.5vh;
    background: rgba(240, 240, 240, 1);
    overflow: hidden;
    transform: scale(1);
}