Maingron/MainOS

* {
    box-sizing: border-box;
}

body {
    height: 100vh;

    main {
        display: flex;
        flex-direction: column;
        justify-content: center;
        height: 100%;
        width: 100%;
        text-align: center;

        img {
            margin: auto;
            max-height: 100%;
            max-width: 100%;
            object-fit: contain;
            border: 1px solid gray;
        }
    }
}