css flexbox flex-wrap how to control how many lines or rows code example

Example 1: flex wrap css

<style> 
#datadiv {
  width: 200px;
  height: 200px;
  border: 1px solid #c3c3c3;
  display: flex;
  flex-wrap: wrap;
}

#datadiv div {
  width: 50px;
  height: 50px;
}
</style>
</head>
<body>

<h1>The flex-wrap Property</h1>

<div id="datadiv">
  <div style="background-color:red;">A</div>
  <div style="background-color:green;">B</div>
  <div style="background-color:yellow;">C</div>
  <div style="background-color:blue;">D</div>
  <div style="background-color:cyan;">E</div>
  <div style="background-color:indigo;">F</div>
</div>

Example 2: use flex in container with multiple components

.wrap {
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;         /* NEW */
  height: 100px;                  /* NEW */
  justify-content: space-between; /* NEW */
}
.elem1 {
  width: 20%;
  flex-basis: 100%;               /* NEW */
  border: 1px solid red;
}
.elem2,
.elem3 {
  width: 75%;
  flex-basis: 40%;                /* NEW */
  border: 1px solid red;
}

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