.mail-delivery .mail-send-dialog .mail-send-ack {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  margin: 18px 0;
  padding: 0;
}
.mail-delivery .mail-send-dialog .mail-send-ack > input[type="checkbox"] {
  box-sizing: border-box;
  width: 18px;
  min-width: 18px;
  height: 18px;
  min-height: 18px;
  flex: 0 0 18px;
  margin: 3px 0 0;
  padding: 0;
}
.mail-delivery .mail-send-dialog .mail-send-ack > span {
  flex: 1;
  min-width: 0;
  margin: 0;
}