.crt-ssoportal__error {
    display: flex;
    align-items: center;
    justify-content: center;   
}

    .crt-ssoportal__error img {
        max-width:600px !important;
        height:auto;
        background-repeat:no-repeat;
    }

.crt-ssoportal__error .img-thumbnail {
    max-width: 600px !important;
}