reinstalled all contribs with composer

need to run :
drush ev 'drupal_flush_all_caches();'
drush cr
and restart nginx and php-fpm before loading the website

web/themes/custom/edlptheme/templates/block/block--system-branding-block.html.twig

@@ -0,0 +1,32 @@
+{% extends "block.html.twig" %}
+{#
+/**
+ * @file
+ * Theme override for a branding block.
+ *
+ * Each branding element variable (logo, name, slogan) is only available if
+ * enabled in the block configuration.
+ *
+ * Available variables:
+ * - site_logo: Logo for site as defined in Appearance or theme settings.
+ * - site_name: Name for site as defined in Site information settings.
+ * - site_slogan: Slogan for site as defined in Site information settings.
+ */
+#}
+{% block content %}
+  {% if site_logo or site_name %}
+    <h1>
+    {% if site_logo %}
+      <a href="{{ path('<front>') }}" title="{{ 'Home'|t }}" rel="home" class="site-logo" data-drupal-link-system-path="<front>">
+        <img src="{{ site_logo }}" alt="{{ 'Home'|t }}" />
+      </a>
+    {% endif %}
+    {% if site_name %}
+        <a class="site-name" href="{{ path('<front>') }}" title="{{ 'Home'|t }}" rel="home" data-drupal-link-system-path="<front>">{{ site_name }}</a>
+    {% endif %}
+    </h1>
+  {% endif %}
+  {# % if site_slogan %}
+    <h2 class="site-slogan">{{ site_slogan }}</h2>
+  {% endif % #}
+{% endblock %}

web/themes/custom/edlptheme/templates/block/block--system-main-block.html.twig

@@ -0,0 +1,3 @@
+{% block content %}
+  {{ content }}
+{% endblock %}

web/themes/custom/edlptheme/templates/block/block--userlogin.html.twig

@@ -0,0 +1,41 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a block.
+ *
+ * Available variables:
+ * - plugin_id: The ID of the block implementation.
+ * - label: The configured label of the block if visible.
+ * - configuration: A list of the block's configuration values.
+ *   - label: The configured label for the block.
+ *   - label_display: The display settings for the label.
+ *   - provider: The module or other provider that provided this block plugin.
+ *   - Block plugin specific settings will also be stored here.
+ * - content: The content of this block.
+ * - attributes: array of HTML attributes populated by modules, intended to
+ *   be added to the main container tag of this template.
+ *   - id: A valid HTML ID and guaranteed unique.
+ * - title_attributes: Same as attributes, except applied to the main title
+ *   tag that appears in the template.
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title_suffix: Additional output populated by modules, intended to be
+ *   displayed after the main title tag that appears in the template.
+ *
+ * @see template_preprocess_block()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes }}>
+  {{ title_prefix }}
+  {% if label %}
+    <h2{{ title_attributes }}>{{ label }}</h2>
+  {% endif %}
+  {{ title_suffix }}
+  <div class="block-content">
+    {% block content %}
+      {{ content }}
+    {% endblock %}
+  </div>
+</div>