how to center cARDS CSS code example

Example 1: center content/card css

.container {
  display: flex;
  justify-content: center;
  flex-direction: row;
}

Example 2: how to centralize cards in css

.card {
        margin: 0 auto; /* Added */
        float: none; /* Added */
        margin-bottom: 10px; /* Added */
}