flex-box.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box
        {   
            display: flex;
            border: 2px solid red;
            /*flex-wrap: wrap;*/
            width: 1000px;
            height: 500px;
            margin: auto;
            align-items:center;
            flex-direction:column;
        
        }
        .one
        {
            border: 2px solid;
            margin: 60px;
            padding: 10px;
            background-color: blue;
            color: white;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="one"  style="align-self: flex-start;">
            Home
        </div>
        <div class="one">
            About
        </div>
        <div class="one" style="align-self: flex-end;">
            Contact
        </div>
    </div>
</body>
</html>