<div class="wrap">
  <p>コンテナ　align-items: center;</p>
  <div class="flex_container aic">
    <div class="flex_item"></div>
    <div class="flex_item ass">flex-start</div>
    <div class="flex_item ase">flex-end</div>
  </div> 
</div>
.aic {
  align-items: center;
}
.ass {
  align-self: flex-start;
}
.ase {
  align-self: flex-end;
}

.flex_container {
  width: 250px;
  height: 200px;
  border: 1px dotted black;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}
.flex_item {
  width: 50px;
  height: 50px;
  border: 1px solid black;
  background-color: #008dab;
  font-size: 14px;
}

.wrap {
  min-width: max-content;
  margin: 0;
  padding: 10px;
  border: 1px solid gray;
  background-color: #ddd;
}
.wrap p {
  margin: 24px 0 5px;
}
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