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<body>
    <div class="container">
        <div class="flex">
            flex
        </div>
        <div class="flex">
            flex
        </div>
        <div class="flex">
            flex
        </div>
        <div class="flex">
            flex
        </div>
        <div class="flex">
            flex
        </div>
    </div>
</body>

.container{
  width:800px;
  height:200px;
  display: flex;
  border:1px solid black;
}
.flex{
  background:red;
  margin:5px;
  flex:1
}

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