.head {
  margin: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
}

.head-item {
  margin-left: 0.5em;
  margin-right: 0.5em;
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
}

.head-item:first-child {
  margin-left: 0;
}

.head-item:last-child {
  margin-right: 0;
}

.head-item-shrink {
  flex-shrink: 0;
}

.head-item-grow {
  flex-grow: 1;
}