.o_disabled_offline {
    cursor: not-allowed !important;
    pointer-events: auto !important;
    opacity: 0.5 !important;
}

// must override this rule https://github.com/odoo/odoo/blob/9e3b9bd085483ba0e0e956762fc0ad7d759eec73/addons/web/static/src/webclient/webclient.scss#L140
.o_disabled_offline[type="action"],
.o_disabled_offline[type="toggle"] {
    cursor: not-allowed !important;
}