フッターを画面下に表示させる
参考：https://public-constructor.com/footer-at-bottom-with-flexbox/
結論
<body >
<div class="container-fluid mx-0 px-0 test">
{% include 'config/include/navbar.html' %}
{% block content %}
{% endblock %}
<div class="espacio">
</div>
{% include 'config/include/bottom.html' %}
</div>
.test {
display: flex;
flex-flow: column;
min-height: 100vh;
}
.espacio{
flex: 1;
}
footer {
background: #333333;
color: #ffffff;
height: 80px;
}
