@if (session()->has('login_success'))
    <div id="loginFlash">{{ session('login_success') }}</div>
@endif

{% for message in messages %}
    <div id="{{ message.tags }}">
        {{ message }}
    </div>
{% endfor %}

messages.add_message(self.request, messages.INFO, self.request.user.username, 'loginFlash')

<div class="loginFlash info">
    username
</div>