<!DOCTYPE html>
<html>
<head>
    <style>
        .box {
            background-color: green;
            display: inline-block;
        }
        .small-box {
            width: 100px;
            height: 100px;
        }
        .large-box {
            width: 200px;
            height: 200px;
        }
    </style>
</head>
<body>
    <div class="box small-box"></div>
    <div class="box large-box"></div>
    <div class="box small-box"></div>
    <br>
    <div class="box small-box"></div>
    <div class="box large-box"></div>
    <div class="box small-box"></div> 
</body>
</html>