Center Div Laravel Bootstrap

center.blade.php

@extends('layouts.app-nonav')

@section('styles')
    <style>
        div.container{
            height: calc(100vh - 16px);
        }

        div.login {
            width: 100%;
        }
    </style>
@endsection

@section('content')
    <div class="container d-flex">
        <div class="login align-self-center text-center">
            <p class="h3">You are not currently logged in.</p>
            <a href="{{ $zestUrl }}" class="btn btn-primary">Please login here with your Zest website.</a>
        </div>
    </div>
@endsection