[CSS] margin, padding

margin

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        div {
            width: 100px;
            height: 100px;
            color: white;
        }
        .redBox{
            background-color: red;
        }
        .blueBox {
            background-color: blue;
            margin-left: 100px;
        }
        .greenBox {
            background-color: green;
            margin-left: 200px;
        }
        .grayBox {
            background-color: gray;
            margin-left: 300px;
        }

    </style>
</head>
<body>
    <div class="redBox">Box</div>
    <div class="blueBox">Box</div>
    <div class="greenBox">Box</div>
    <div class="grayBox">Box</div>
</body>
</html>

padding

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        div {
            width: 100px;
            height: 100px;
            color: white;
        }
        .redBox{
            background-color: red;
        }
        .blueBox {
            background-color: blue;
            padding-left: 100px;
        }
        .greenBox {
            background-color: green;
            padding-left: 200px;
        }
        .grayBox {
            background-color: gray;
            padding-left: 300px;
        }

    </style>
</head>
<body>
    <div class="redBox">Box</div>
    <div class="blueBox">Box</div>
    <div class="greenBox">Box</div>
    <div class="grayBox">Box</div>
</body>
</html>