방향성에따라서 축방향에따라서 너비를 정하고싶을때는 flex-basic를 사용하면 된다.

ex) 사용의예

<!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>
    <link href="layout.css" type="text/css" rel ="stylesheet">
</head>
<body>
    <section class = "s1">
        <h1>flex box</h1>
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ul>
    </section>
</body>
</html>
@import url(css/reset.css);

.s1 ul {
    display:  flex;
    flex-direction: row;
    background: gray;
}

.s1 li:nth-child(1){
    background: red;
    flex-basis: 100px;
}

.s1 li:nth-child(2){
    background: green;
}

.s1 li:nth-child(3){
    background: blue;
}

.s1 li:nth-child(4){
    background: yellow;
}

.s1 li:nth-child(5){
    background: lightskyblue;
}

flexbox

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