how to allign a box right html css code example

Example 1: how to align elements horizontally in css

.row {
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: center;
}
.block {
  width: 100px;
}

Example 2: how to align items in css

div
{
  display:flex;
  align-items:center;
  justify-content:center;
  
}