.signature-image {
    max-width: 1000px;
    width: 85%;
}

.center-block {
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-top: 3em;
}

.align {
    text-align: center;
    display: block;
}

@media screen and (max-width: 420px) {
    .signature-image {
        width: 100%;
    }
}