center block element vertically code example

Example 1: css center horizontally and vertically

.parent {
  position: relative;
}
.child {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

Example 2: center elements vertically in div

.container {        
    display: flex;
    align-items: center;
}