.field.field--name-node-changed-date.field--type-ds.field--label-hidden.field--item:before {
    content: 'Last update: ';
}
.field.field--name-node-changed-date.field--type-ds.field--label-hidden.field--item {
    font-size: 1.2rem;
    font-weight: 600;
    color: #ffffff;
    margin-top: 20px;
    padding:5px 10px;
    border-radius:5px;
    background-color:#737373;
    display:inline-block;
}