You can use asset() function to access your css and javascript files in twig blocks as shown below.

base.html.twig

You need to place css in web/assets/css/ and js in web/assets/js/ folders.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>{% block title %}Welcome!{% endblock %}</title>
        {% block stylesheets %}
            <link href="{{ asset('assets/css/common.css') }}" rel="stylesheet" />
        {% endblock %}
        <link rel="icon" type="image/x-icon" href="{{ asset('favicon.ico') }}" />
    </head>
    <body>
        {% block body %}{% endblock %}
        {% block javascripts %}
            <script src="{{ asset('assets/js/common.js') }}"></script>
        {% endblock %}
    </body>
</html>

#twig #css #javascript #twig

How to include CSS and Javascript Files As Assets In Twig
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