nr.1 test

src/Resources/app/storefront/src/scss/_header-search.scss

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+.header-search { margin: 0;}

src/Resources/app/storefront/src/scss/base.scss

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+@import "header-search.scss";

src/Resources/app/storefront/src/scss/overrides.scss

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+/*
+Override variable defaults
+==================================================
+This file is used to override default SCSS variables from the Shopware Storefront or Bootstrap.
+
+Because of the !default flags, theme variable overrides have to be declared beforehand.
+https://getbootstrap.com/docs/4.0/getting-started/theming/#variable-defaults
+*/

src/Resources/theme.json

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+{
+  "name": "Unsertheme",
+  "author": "Shopware AG",
+  "views": [
+     "@Storefront",
+     "@Plugins",
+     "@Unsertheme"
+  ],
+  "style": [
+    "app/storefront/src/scss/overrides.scss",
+    "@Storefront",
+    "app/storefront/src/scss/base.scss"
+  ],
+  "script": [
+    "@Storefront",
+    "app/storefront/dist/storefront/js/unsertheme.js"
+  ],
+  "asset": [
+    "@Storefront",
+    "app/storefront/src/assets"
+  ]
+}

src/Resources/views/storefront/layout/header/header.html.twig

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+{% sw_extends "@Storefront/storefront/layout/header/header.html.twig" %} 
+
+{% block layout_header_navigation %}
+        <div class="row align-items-center header-row">
+            
+
+            {% block layout_header_search %}
+                <div class="col-12 order-sm-1  col-lg-4 header-search-col">
+                    <div class="row">
+                        <div class="col-sm-auto d-none d-sm-block d-lg-none">
+                            {% block layout_header_navigation_toggle_tablet %}
+                                {{ parent() }}
+                            {% endblock %}
+                        </div>
+                        <div class="col">
+                            {% sw_include '@Storefront/storefront/layout/header/search.html.twig' %}
+                        </div>
+                    </div>
+                </div>
+            {% endblock %}
+	    
+	    {% block layout_header_logo %}
+                <div class="col-8 order-2 col-lg-6 header-logo-col">
+                    {% sw_include '@Storefront/storefront/layout/header/logo.html.twig' %}
+                </div>
+            {% endblock %}
+
+            {% block layout_header_actions %}
+                {{ parent() }}
+		
+            {% endblock %}
+	    
+	    {#{%  block dump_vars %}
+		<div style="position: fixed; left:0; top:10vh; height: 10vh; width: 100vh; padding: 20px: z-index:1000000">
+		    {{ dump() }}
+		</div>
+	    {%  endblock %}#}
+        </div>
+	
+	
+    {% endblock %}
+    
+    

src/Unsertheme.php

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+<?php declare(strict_types=1);
+
+namespace Unsertheme;
+
+use Shopware\Core\Framework\Plugin;
+use Shopware\Storefront\Framework\ThemeInterface;
+
+class Unsertheme extends Plugin implements ThemeInterface
+{
+    public function getThemeConfigPath(): string
+    {
+        return 'theme.json';
+    }
+}