Live Demo: Set Fixed Space Between Flex Items

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Set Fixed Space Between Flex Items</title>
<style>
    .flex-container {
        height: 300px;
        display: flex;
        border: 1px solid black;
        padding: 10px;
    }
    .item {
        flex: auto;
        background: #b4bac0;
        margin: 10px;
    }
</style>
</head>
<body>
    <div class="flex-container">
        <div class="item">Item 1</div>
        <div class="item">Item 2</div>
        <div class="item">Item 3</div>
        <div class="item">Item 4</div>
    </div>
</body>
</html>