Centralizar div verticalmente css

#parent {
  align-items: center;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
}
#child {
	width: 20px;
}

Centrer verticalement css

.parent {
  position: relative;
}
.enfant {
  position: absolute;
  top: 50%; /* poussé de la moitié de hauteur du référent */
  transform: translateY(-50%); /* tiré de la moitié de sa propre hauteur */
}

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