Problema GRID | Flexbox: posicione elementos na tela

Uma opção para resolver o problema de grid é:

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Alurinha | Cursos online</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="grid">
        <div class="box">Ruby on Rails</div>
        <div class="box">Java</div>
        <div class="box">HTML</div>
        <div class="box">Python</div>
        <div class="box">Wordpress</div>
        <div class="box">Bootstrap</div>
        <div class="box">Java Web</div>
        <div class="box">MySQL</div>
    </div>
</body>

No style.css inserimos:

.grid{
    display: flex;
    flex-wrap: wrap;
}

.box {
    height: 50px;
    width: 23%;
    margin: 1%;
    background-color: rosybrown;
    color: aliceblue;
    display: flex;
    justify-content: center;
    align-items: center;
}

.box:nth-child(4n) {
    margin-right: 0;
}

.box:nth-child(4n + 1) {
    margin-left: 0;
}