horizon/openstack_dashboard/static/app/core/keypairs/_keypairs.scss

hz-resource-property-list[resource-type-name="OS::Nova::Keypair"] {
  hz-resource-property[prop-name="public_key"] dd {
    overflow-wrap: break-word;
    width: calc(100vw - 61px);
    @media (min-width: 992px) {
      width: calc(100vw - 281px);
    }
  }
}