image_header.html

{% load wagtailcore_tags wagtailimages_tags %}
{% if self.large %}
{% image value.image fill-1000x500 as image %}
{% image value.cover fill-1000x500 as cover %}
{% else %}
{% image value.image fill-1000x200 as image %}
{% image value.cover fill-1000x200 as cover %}
{% endif %}

<style>
    .image-header{
        display:flex;
        align-items: {% if value.large%}flex-end{% else %}center{% endif %};
        color:white;
        margin-bottom: 3rem;

        {% if value.large %}
        min-height:500px;
        {% else%}
        min-height:200px;
        {% endif%}
        background-size:cover !important;
    }

    .image-header .title{
        padding: 15px 20px 0;
        width: 700px;
        font-size: 1.3rem;
        margin: 0 auto;
    }

    .image-header .title.large{
        margin-bottom: 5rem;
    }
</style>
<section class="image-header"
    style="{%if value.title%} background: linear-gradient(rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.2)), url({% if image %}{{image.url}}{% else %}{{cover.url}}{%endif%});{%else%}background:url({% if image %}{{image.url}}{% else %}{{cover.url}}{%endif%});{%endif%} {{ image.background_position_style }}">

    {% if value.title %}
    <div class="title {% if value.large %}large{%endif%}">
        <h1>{{value.title}}</h1>
    </div>
    {% endif %}
</section>