first child not working in a tag don't working

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I can't apply the first-child selection to my "a" tag. What could be the cause of the problem? I shared my codes in the link below.

My HTML CODE

    <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title></title>
    <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
    <header id="header">
        <div class="header-row">
            <div class="navbar">
                <ul class="menu">
                    <li class="menu-item"><a href="#" class="menu-item-link">Menu 1</a></li>
                    <li class="menu-item"><a href="#" class="menu-item-link">Menu 1</a></li>
                    <li class="menu-item"><a href="#" class="menu-item-link">Menu 1</a></li>
                    <li class="menu-item"><a href="#" class="menu-item-link">Menu 1</a></li>
                </ul>
            </div>
        </div>
    </header>
</body>
</html>

MY CSS CODE

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
ul{
    list-style: none;
}
a{
    text-decoration: none;
}
.header-row{
    width: 1100px;
    height: 70px;
    background-color: #121454;
    margin: 0 auto;
}
ul.menu{
    display: flex;
    flex-wrap: wrap;
}
a{
    display: block;
    color: #fff;
    padding: 20px;
    height: 100%;
}
ul li a:first-child{
    background-color: #fff;  /* not working*/
}

Applies to all my "a" tags other than the first effect I can speak English a little. Thank you everyone

0 Answers
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