diff --git a/assets/styles/components/forms.css b/assets/styles/components/forms.css
index b722f56..19d52c5 100644
--- a/assets/styles/components/forms.css
+++ b/assets/styles/components/forms.css
@@ -8,7 +8,7 @@ label.required:after {
 }
 
 .form-field--has-error {
-    @apply border-red-500;
+    @apply border-red-700;
 }
 
 .form-checkbox,
@@ -18,7 +18,7 @@ label.required:after {
 
 .form-checkbox--has-error,
 .form-radio--has-error {
-    @apply border-red-500;
+    @apply border-red-700;
 }
 
 select[readonly] {
diff --git a/templates/_partials/_alert.html.twig b/templates/_partials/_alert.html.twig
index cd982be..36b0941 100644
--- a/templates/_partials/_alert.html.twig
+++ b/templates/_partials/_alert.html.twig
@@ -19,19 +19,17 @@
             {% endif %}
         </div>
         <div class="ml-3">
-            {% if messages | length == 1 %}
-                <p class="{{ html_classes('text-sm font-medium', { 'text-red-800': level == 'error', 'text-green-800': level == 'success', 'text-blue-800': level == 'info' }) }}">
-                    {{ messages[0] }}
-                </p>
-            {% else %}
-                <h3 class="{{ html_classes('text-sm font-medium', { 'text-red-800': level == 'error', 'text-green-800': level == 'success', 'text-blue-800': level == 'info' }) }}">
-                    {{ title is defined ? title : 'Es gab mehrere Probleme' }}
-                </h3>
-                <div class="{{ html_classes('mt-2 text-sm', { 'text-red-700': level == 'error', 'text-green-700': level == 'success', 'text-blue-700': level == 'info' }) }}">
-                    <ul role="list" class="list-disc space-y-1 pl-5">
+            {% if title is defined %}
+                <div class="{{ html_classes('text-sm', { 'text-red-700': level == 'error', 'text-green-800': level == 'success', 'text-blue-800': level == 'info', 'mb-2': messages is defined }) }}">
+                    {{ title }}
+                </div>
+            {% endif %}
+            {% if messages is defined %}
+                <div class="{{ html_classes('text-sm', { 'text-red-700': level == 'error', 'text-green-800': level == 'success', 'text-blue-800': level == 'info' }) }}">
+                    <ul role="list" class="list-disc space-y-1 pl-4">
                         {% for message in messages %}
                             <li>
-                                {{ message }}
+                                {{ message|raw }}
                             </li>
                         {% endfor %}
                     </ul>
diff --git a/templates/booking/edit.html.twig b/templates/booking/edit.html.twig
index 9753cc9..c96acbe 100644
--- a/templates/booking/edit.html.twig
+++ b/templates/booking/edit.html.twig
@@ -4,8 +4,19 @@
     {% include '_partials/_flashes.html.twig' %}
     {{ form_start(form) }}
     {% if not form.vars.valid %}
-        {% set messages = form.vars.errors|map(error => error.message) %}
-        {% include '_partials/_alert.html.twig' with { 'level': 'error', 'title': 'Die Buchung konnte nicht aktualisiert werden', 'messages': messages  } %}
+        {% include '_partials/_alert.html.twig' with { 'level': 'error', 'title': 'Die Buchung konnte nicht aktualisiert werden' } %}
+        {% for child in form.participants.children %}
+            {% if not child.vars.valid %}
+                {% set participant = child.vars.data %}
+                {% set messages = [] %}
+                {% for field in child.children %}
+                    {% for error in field.vars.errors %}
+                        {% set messages = messages|merge([field.vars.label ~ ': ' ~ error.message]) %}
+                    {% endfor %}
+                {% endfor %}
+                {% include '_partials/_alert.html.twig' with { 'level': 'error', 'title': 'Teilnehmer:in ' ~ participant.index ~ ':' ~ participant.firstName ~ participant.lastName, 'messages': messages } %}
+            {% endif %}
+        {% endfor %}
     {% endif %}
     <div class="flex flex-col space-y-8 pb-8" {{ stimulus_controller('booking', { 'availabilities': availabilities.items }) }} {{ stimulus_controller('iframe', { 'offsetTop': 100 }) }}>
         <div class="p-8 border border-gray-300 rounded-md"
@@ -103,16 +114,16 @@
             </div>
         </div>
         {% for child in form.participants %}
-            <div>
-                {% set participant = child.vars.data %}
+            {% set participant = child.vars.data %}
+            <div id="participant-{{ participant.index }}">
                 {% if participant.status == 'S' %}
                     {% do child.setRendered %}
                 {% endif %}
-                <div class="{{ html_classes('p-8 border rounded-md mb-4', { 'border-gray-300': child.vars.valid, 'border-red-500': not child.vars.valid }) }}" {{ stimulus_controller('toggle', {'open': child.vars.valid == false}, { 'closed': 'hidden' }) }}>
+                <div class="{{ html_classes('p-8 border rounded-md mb-4', { 'border-gray-300': child.vars.valid, 'border-red-700': not child.vars.valid }) }}" {{ stimulus_controller('toggle', {'open': child.vars.valid == false}, { 'closed': 'hidden' }) }}>
                     <div role="button" class="flex items-center justify-between" {{ stimulus_action('toggle', 'toggle', 'click') }}>
                         <div class="flex items-center space-x-4">
                             <span class="text-2xl leading-none font-semibold">Teilnehmer:in {{ participant.index }}: {{ participant.firstName }} {{ participant.lastName }}</span>
-                            {% if participant.status == 'S' %} <span class="inline-block px-2 py-1 text-xs bg-red-500 text-white">storniert</span>{% endif %}
+                            {% if participant.status == 'S' %} <span class="inline-block px-2 py-1 text-xs bg-red-700 text-white">storniert</span>{% endif %}
                         </div>
                         <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-6 h-6" {{ stimulus_target('toggle', 'icon') }}>
                             <path stroke-linecap="round" stroke-linejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
diff --git a/templates/forms.html.twig b/templates/forms.html.twig
index 6dc76b0..71728b0 100644
--- a/templates/forms.html.twig
+++ b/templates/forms.html.twig
@@ -17,7 +17,7 @@
 {%- block form_label -%}
     {% set class = 'font-semibold' %}
     {% if errors|length %}
-        {% set class = class ~ ' text-red-500' %}
+        {% set class = class ~ ' text-red-700' %}
     {% endif %}
     {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ class)|trim}) %}
     {{ parent() }}
@@ -27,7 +27,7 @@
     {%- if errors|length > 0 -%}
         <ul class="pb-2">
             {%- for error in errors -%}
-                <li class="text-red-500">{{ error.message }}</li>
+                <li class="text-red-700">{{ error.message }}</li>
             {%- endfor -%}
         </ul>
     {%- endif -%}
@@ -99,7 +99,7 @@
             <div class="flex h-6 items-center">
                 {{ form_widget(form) }}
             </div>
-            <div class="{{ html_classes('ml-1 leading-6', { 'text-red-500': errors|length }) }}">
+            <div class="{{ html_classes('ml-1 leading-6', { 'text-red-700': errors|length }) }}">
                 <label for="{{ form.vars.id }}" class="{{ html_classes({ 'pointer-events-none': form.vars.attr.readonly is defined }) }}">
                     {{ form.vars.label | raw }}
                 </label>