Porque me conteúdo está ficando abaixo da navbar(header)? Deveria ficar abaixo, o que preciso fazer? e outra caso eu der zoom, também não queria que o conteúdo fosse para baixo do navbar(header).
<!DOCTYPE html lang = "PT-BR">
<html>
<head>
<meta charset = "UTF-8">
<title>Login</title>
<link rel="stylesheet" href="reset.css">
<!-- <link rel="stylesheet" href="login.css"> -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"
integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<link rel="stylesheet" href="css/menu.css">
<link rel="stylesheet" href="css/servicos.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-warning text-dark fixed-top">
<a class="navbar-brand" href="menu.html"><img src="img/preta.png" alt="" class="banner"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-end" id="navbarNavAltMarkup">
<div class="navbar-nav">
<a class="nav-link active" href="servicos.html">Serviços</a>
<a class="nav-link" href="#">Prestadores</a>
<a class="nav-link" href="#">Cálculos</a>
<a class="nav-link" href="#">Indicadores</a>
<a class="nav-link" href="#">Cadastro</a>
</div>
</div>
</nav>
<main>
<h3 class="text-center">O que desejas?</h3>
<div class="container">
<div class="row row-cols-6 .align-items-center justify-content-around">
<div class="col">Criar servico</div>
<div class="col">Verficar serviços</div>
<div class="col">Column</div>
<div class="col">Column</div>
<div class="col">Column</div>
</div>
</div>
</main>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
</body>
</html>
/* .container .div-container{
margin: 12% auto 0;
}
main{
margin: 12% auto 0;
}
.container{
padding: 0;
} */
.col{
border: orangered solid 1px;
border-radius: 15px;
cursor: pointer;
height: 10vw;
}