div.error-outer {
    display: flex;
    align-items: center;
    height: 100vh;
}

    div.error-outer div.error {
        display: flex;
        flex-flow: column;
        justify-content: center;
        align-items: center;
        height: 100%;
        width: 100%;
    }

        div.error-outer div.error .error-headline {
            font-size: 3rem;
            line-height: 4rem;
        }

        div.error-outer div.error .error-body {
            font-size: 2rem;
        }