html, body, #layout-content {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}
h1 {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
h1 img {
    width: 50vw;
    max-height: 90vh;
}

html, body, #layout-content {
        height: 100%;
        margin: 0;
        padding: 0;
        font-family: arial;
}

h1 img {
        width: 400px;
}