how to vertical align middle in div code example

Example 1: center elements vertically in div

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

Example 2: css vertical align items in div

.flex-center-vertically {
  display: flex;
  justify-content: center;
  flex-direction: column;
  height: 400px;
}

Example 3: css center div vertically

/* center vertically */
/* No Flexbox */
.parent {
  position: relative;
}
.child {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}



/* With Flexbox */

.parent {
  display: flex;
  flex-direction: column;
  justify-content: center;
}