diff --git a/Makefile b/Makefile
index 09475d90..3e2af6c2 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,10 @@ develop: ## Install the test and dev dependencies
 pretty-templates: ## Prettify template files
 	djlint umap/templates --reformat
 
+.PHONY: lint-templates
+lint-templates: ## Lint template files
+	djlint umap/templates --lint
+
 .PHONY: version
 version: ## Display the current version
 	@hatch version
diff --git a/umap/templates/404.html b/umap/templates/404.html
index 615f31e1..1fd8b057 100644
--- a/umap/templates/404.html
+++ b/umap/templates/404.html
@@ -2,13 +2,14 @@
 {% load i18n static %}
 {% block content %}
   <div class="content404">
-    <a href="/" title="{% trans 'Take me to the home page' %}">
+    <a href="{% url "home" %}"
+       title="{% trans "Take me to the home page" %}">
       <h1>
         4
-        <img src="{% static 'umap/img/logo.svg' %}">
+        <img alt="0" width="128px" height="128px" src="{% static "umap/img/logo.svg" %}">
         4
       </h1>
       <h2>Not Found</h2>
     </a>
   </div>
-{% endblock %}
+{% endblock content %}
diff --git a/umap/templates/500.html b/umap/templates/500.html
index a1c762c8..5f94dfd5 100644
--- a/umap/templates/500.html
+++ b/umap/templates/500.html
@@ -1,8 +1,11 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     <title>Ooops</title>
     <meta charset="utf-8">
+    <meta name="description"
+          content="uMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site.">
+    <meta name="keywords" content="map, umap">
     <style type="text/css">
         #container {
             width: 400px;
@@ -16,8 +19,10 @@
   <body>
     <div id="container">
       <img alt=""
+           width="128px"
+           height="128px"
            src="data:image/svg+xml;base64,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" />
-      <p>Oops, Server error…</p>
+      <h1>Oops, Server error…</h1>
     </div>
   </body>
 </html>
diff --git a/umap/templates/base.html b/umap/templates/base.html
index f0f08648..4d93f5bd 100644
--- a/umap/templates/base.html
+++ b/umap/templates/base.html
@@ -3,15 +3,20 @@
 <html {% if LANGUAGE_BIDI %}dir="rtl"{% endif %}>
   <head>
     <title>
-      {% block head_title %}{{ SITE_NAME }}{% endblock %}
+      {% block head_title %}
+        {{ SITE_NAME }}
+      {% endblock head_title %}
     </title>
     <meta charset="utf-8">
+    <meta name="description"
+          content="{% trans "uMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site." %}">
+    <meta name="keywords" content="map, umap">
     {% block extra_head %}
     {% endblock extra_head %}
     <meta name="viewport"
           content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
   </head>
-  <body class="{% block body_class %}{% endblock %}">
+  <body class="{% block body_class %}{% endblock body_class %}">
     {% block header %}
     {% endblock header %}
     {% block content %}
diff --git a/umap/templates/registration/login.html b/umap/templates/registration/login.html
index 8339cb53..c9edc372 100644
--- a/umap/templates/registration/login.html
+++ b/umap/templates/registration/login.html
@@ -3,20 +3,20 @@
   <h5>{% trans "Please log in with your account" %}</h5>
   <div>
     {% if form.non_field_errors %}
-      <ul class='form-errors'>
+      <ul class="form-errors">
         {% for error in form.non_field_errors %}<li>{{ error }}</li>{% endfor %}
       </ul>
     {% endif %}
-    <form id='login_form' action="{% url 'login' %}" method="POST">
+    <form id="login_form" action="{% url "login" %}" method="post">
       {% csrf_token %}
       {{ form.username.errors }}
       <input type="text"
              name="username"
-             placeholder="{% trans 'Username' %}"
+             placeholder="{% trans "Username" %}"
              autofocus />
       {{ form.password.errors }}
-      <input type="password" name="password" placeholder="{% trans 'Password' %}" />
-      <input type="submit" value="{% trans 'Login' %}" />
+      <input type="password" name="password" placeholder="{% trans "Password" %}" />
+      <input type="submit" value="{% trans "Login" %}" />
     </form>
   </div>
 {% endif %}
diff --git a/umap/templates/umap/about_summary.html b/umap/templates/umap/about_summary.html
index 6a1756c2..870047eb 100644
--- a/umap/templates/umap/about_summary.html
+++ b/umap/templates/umap/about_summary.html
@@ -2,13 +2,21 @@
 <div class="wrapper about_summary  highlights">
   <div class="row">
     <div class="col quarter mwide">
-      <img class="colophon" src="{{ STATIC_URL }}umap/img/osm.svg" />
+      <img class="colophon"
+           src="{{ STATIC_URL }}umap/img/osm.svg"
+           alt=""
+           width="128px"
+           height="128px" />
       <p>
         {% blocktrans with osm_url="http://osm.org" %}uMap lets you create maps with <a href="{{ osm_url }}" />OpenStreetMap</a> layers in a minute and embed them in your site.{% endblocktrans %}
       </p>
     </div>
     <div class="col umap-features-list half mwide">
-      <img class="colophon" src="{{ STATIC_URL }}umap/img/edit.svg" />
+      <img class="colophon"
+           src="{{ STATIC_URL }}umap/img/edit.svg"
+           alt=""
+           width="128px"
+           height="128px" />
       <ul>
         <li>{% trans "Choose the layers of your map" %}</li>
         <li>{% trans "Add POIs: markers, lines, polygons..." %}</li>
@@ -20,7 +28,11 @@
       </ul>
     </div>
     <div class="col quarter mwide">
-      <img class="colophon" src="{{ STATIC_URL }}umap/img/opensource.svg" />
+      <img class="colophon"
+           src="{{ STATIC_URL }}umap/img/opensource.svg"
+           alt=""
+           width="128px"
+           height="128px" />
       <p class="note">
         {% blocktrans with repo_url="https://github.com/umap-project/umap" %}And it's <a href="{{ repo_url }}">open source</a>!{% endblocktrans %}
       </p>
diff --git a/umap/templates/umap/content.html b/umap/templates/umap/content.html
index c772d8ff..26a2afd7 100644
--- a/umap/templates/umap/content.html
+++ b/umap/templates/umap/content.html
@@ -1,18 +1,20 @@
 {% extends "base.html" %}
 {% load umap_tags compress i18n %}
-{% block body_class %}content{% endblock %}
+{% block body_class %}
+  content
+{% endblock body_class %}
 {% block extra_head %}
   {% compress css %}
     {% umap_css %}
   {% endcompress css %}
   {% umap_js %}
-{% endblock %}
+{% endblock extra_head %}
 {% block header %}
   <header class="wrapper row">
-    {% include 'umap/navigation.html' with title=SITE_NAME %}
+    {% include "umap/navigation.html" with title=SITE_NAME %}
   </header>
-  {% include 'umap/messages.html' with title=SITE_NAME %}
-{% endblock %}
+  {% include "umap/messages.html" with title=SITE_NAME %}
+{% endblock header %}
 {% block content %}
   {% if UMAP_READONLY %}
     <div class="wrapper demo-instance-warning">
diff --git a/umap/templates/umap/content_footer.html b/umap/templates/umap/content_footer.html
index 66570584..51d1d3d1 100644
--- a/umap/templates/umap/content_footer.html
+++ b/umap/templates/umap/content_footer.html
@@ -1,4 +1,4 @@
-{% load  i18n %}
+{% load i18n %}
 <footer>
   <a href="https://wiki.openstreetmap.org/wiki/UMap" class="branding">uMap</a>
   an OpenStreetMap project
diff --git a/umap/templates/umap/map_detail.html b/umap/templates/umap/map_detail.html
index 162b72f6..25f927e7 100644
--- a/umap/templates/umap/map_detail.html
+++ b/umap/templates/umap/map_detail.html
@@ -1,17 +1,21 @@
 {% extends "base.html" %}
 {% load umap_tags compress i18n %}
-{% block head_title %}{{ map.name }} - {{ SITE_NAME }}{% endblock %}
-{% block body_class %}map_detail{% endblock %}
+{% block head_title %}
+  {{ map.name }} - {{ SITE_NAME }}
+{% endblock head_title %}
+{% block body_class %}
+  map_detail
+{% endblock body_class %}
 {% block extra_head %}
   {% compress css %}
     {% umap_css %}
   {% endcompress %}
   {% umap_js locale=locale %}
   {% if object.share_status != object.PUBLIC %}<meta name="robots" content="noindex">{% endif %}
-{% endblock %}
+{% endblock extra_head %}
 {% block content %}
   {% block map_init %}
     {% include "umap/map_init.html" %}
-  {% endblock %}
+  {% endblock map_init %}
   {% include "umap/map_messages.html" %}
-{% endblock %}
+{% endblock content %}
diff --git a/umap/templates/umap/navigation.html b/umap/templates/umap/navigation.html
index 98974f92..d6c753a7 100644
--- a/umap/templates/umap/navigation.html
+++ b/umap/templates/umap/navigation.html
@@ -2,7 +2,7 @@
 <nav class="umap-nav">
   <section>
     <h1>
-      <a href="/">{{ title }}</a>
+      <a href="{% url "home" %}">{{ title }}</a>
     </h1>
   </section>
   <section>
@@ -16,11 +16,11 @@
         </li>
       {% else %}
         <li>
-          <a href="{% url 'login' %}" class="login">{% trans "Log in" %} / {% trans "Sign in" %}</a>
+          <a href="{% url "login" %}" class="login">{% trans "Log in" %} / {% trans "Sign in" %}</a>
         </li>
       {% endif %}
       <li>
-        <a href="{% url 'about' %}">{% trans "About" %}</a>
+        <a href="{% url "about" %}">{% trans "About" %}</a>
       </li>
       <li>
         <a href="{{ UMAP_FEEDBACK_LINK }}">{% trans "Help" %}</a>
@@ -28,18 +28,18 @@
       {% if user.is_authenticated %}
         {% if user.has_usable_password %}
           <li>
-            <a href="{% url 'password_change' %}">{% trans "Change password" %}</a>
+            <a href="{% url "password_change" %}">{% trans "Change password" %}</a>
           </li>
         {% endif %}
         <li>
-          <a href="{% url 'logout' %}" class="logout">{% trans "Log out" %}</a>
+          <a href="{% url "logout" %}" class="logout">{% trans "Log out" %}</a>
         </li>
       {% endif %}
     </ul>
   </section>
   <section>
     {% if not UMAP_READONLY %}
-      <a href="{% url 'map_new' %}" class="button">{% trans "Create a map" %}</a>
+      <a href="{% url "map_new" %}" class="button">{% trans "Create a map" %}</a>
     {% endif %}
   </section>
 </nav>
diff --git a/umap/templates/umap/password_change.html b/umap/templates/umap/password_change.html
index fbec7e2f..ad7389ec 100644
--- a/umap/templates/umap/password_change.html
+++ b/umap/templates/umap/password_change.html
@@ -5,21 +5,21 @@
   <p>
     {% trans "Please enter your old password, for security's sake, and then enter your new password twice so we can verify you typed it in correctly." %}
   </p>
-  <form action="{% url 'password_change' %}" method="POST">
+  <form action="{% url "password_change" %}" method="get">
     {% csrf_token %}
     {{ form.old_password.errors }}
-    <input type='password'
-           name='old_password'
-           placeholder='{% trans "Old password" %}'
+    <input type="password"
+           name="old_password"
+           placeholder="{% trans "Old password" %}"
            autofocus />
     {{ form.new_password1.errors }}
-    <input type='password'
-           name='new_password1'
-           placeholder='{% trans "New password" %}' />
+    <input type="password"
+           name="new_password1"
+           placeholder="{% trans "New password" %}" />
     {{ form.new_password2.errors }}
-    <input type='password'
-           name='new_password2'
-           placeholder='{% trans "New password confirmation" %}' />
-    <input type='submit' value='{% trans "Change my password" %}' />
+    <input type="password"
+           name="new_password2"
+           placeholder="{% trans "New password confirmation" %}" />
+    <input type="submit" value="{% trans "Change my password" %}" />
   </form>
 {% endblock content %}
diff --git a/umap/templates/umap/search.html b/umap/templates/umap/search.html
index ad82fcae..3f3e3ae4 100644
--- a/umap/templates/umap/search.html
+++ b/umap/templates/umap/search.html
@@ -13,7 +13,7 @@
               {{ count }} maps found:
             {% endblocktranslate %}
           </h2>
-          {% include "umap/map_list.html" with prefix='search_map' %}
+          {% include "umap/map_list.html" with prefix="search_map" %}
         {% else %}
           <h2>{% trans "No map found." %}</h2>
         {% endif %}
diff --git a/umap/templates/umap/search_bar.html b/umap/templates/umap/search_bar.html
index e6373fc7..b854e9ca 100644
--- a/umap/templates/umap/search_bar.html
+++ b/umap/templates/umap/search_bar.html
@@ -1,15 +1,15 @@
 {% load i18n %}
 <div class="wrapper search_wrapper">
   <div class="row">
-    <form action="{% url 'search' %}" method="GET">
+    <form action="{% url "search" %}" method="get">
       <div class="col two-third mwide">
         <input name="q"
                type="search"
-               placeholder="{% trans 'Search maps' %}"
+               placeholder="{% trans "Search maps" %}"
                value="{{ q|default:"" }}" />
       </div>
       <div class="col third mwide">
-        <input type="submit" value="{% trans 'Search' %}" class="neutral" />
+        <input type="submit" value="{% trans "Search" %}" class="neutral" />
       </div>
     </form>
   </div>
