<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item" id="Item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
</div>
.container {
  width: 100%;
  height: 400px;

  background-color: aliceblue;
  border: skyblue solid 2px;
}

.item {
  background-color: skyblue;

  font-family: "Trebuchet MS", "Lucida Sans Unicode", "Lucida Grande",
    "Lucida Sans", Arial, sans-serif;
  font-size: xx-large;
  color: white;

  text-align: center;
  padding: 10px;

  width: 120px;
}

.container {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 10px;
  height: 300px;

  /* align-content: start; */
  /* align-content: end; */
  /* align-content: center; */
  /* align-content: space-between; */
  /* align-content: space-around; */
  /* align-content: space-evenly; */
  /* align-content: stretch; */

  /* align-items: start; */
  /* align-items: end; */
  /* align-items: center; */
  /* align-items: stretch; */
  /* align-items: baseline; */

  /* justify-content: start; */
  /* justify-content: end; */
  /* justify-content: center; */
  /* justify-content: space-between; */
  /* justify-content: space-around; */
  /* justify-content: space-evenly; */
  /* justify-content: stretch; */

  /* place-content: center; */
  /* place-content: start; */
  /* place-content: end; */
  /* place-content: space-between; */
  /* place-content: space-around; */
  /* place-content: space-evenly; */
  /* place-content: baseline; */
  /* place-content: stretch; */

  /* place-items: start; */
  /* place-items: end; */
  /* place-items: center; */
  /* place-items: stretch; */
  /* place-items: baseline; */
}

#Item {
  /* align-self: start; */
  /* align-self: end; */
  /* align-self: center; */
  /* align-self: baseline; */
  /* align-self: stretch; */

  /* place-self: start; */
  /* place-self: end; */
  /* place-self: center; */
  /* place-self: baseline; */
  /* place-self: stretch; */
}
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