Os botões do vídeo estão ao meio e os do meu código estão a cima | CSS: dispondo elementos com Flexbox e Grid

<!DOCTYPE html>
<html lang="pt-br">
<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>HZC | HOME</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600;700&display=swap">
    <link rel="stylesheet" href="flex-e-grid-main/assets/css/reset.css">
    <link rel="stylesheet" href="flex-e-grid-main/assets/css/estilos.css">
</head>
<body>
    <header class="cabecalho">
        <buttom class="cabecalho__menu">menu</buttom>
        <img src="flex-e-grid-main/assets/img/logo.svg" alt="Logotipo da HZC" class="cabecalho__logo">
        <buttom class="cabecalho__notificacao">notificação</buttom>
    </header>
</body>
</html>

------ css -----

body {
    background-color: #1D232A;
    font-family: 'Open Sans', sans-serif; 
    color: #FFFFFF;
}

.cabecalho {
    display: flex;
    justify-content: space-between;
}

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