.page-error-inner {
    min-height: 40vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.page-error-inner span {
    font-size: 35px;
    font-weight: bold;
}

@media (max-width:767px) {

    .page-error-inner h1,
    .page-error-inner span {
        font-size: 30px;
    }

    .page-error-inner a.button.btn-black {
        margin-top: 10px;
    }
}