From 45db97bc80c3401d7f30515a1d3ee8567df283d7 Mon Sep 17 00:00:00 2001
From: Brian Hanson <brian@brianhanson.net>
Date: Fri, 6 Jun 2025 10:59:47 -0500
Subject: [PATCH 1/2] Fixes #326

---
 src/Field.php | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/Field.php b/src/Field.php
index 1f68bb61..c673c0d6 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1184,11 +1184,8 @@ protected function inputHtml(mixed $value, ?ElementInterface $element, $inline):
             ['type' => 'module']
         );
 
-        if ($ckeConfig->css) {
-            $view->registerCss($ckeConfig->css);
-        }
-
         $value = $this->prepValueForInput($value, $element);
+        $inputId = Html::id('input-ckeditor-' . $id);
         $html = Html::textarea($this->handle, $value, [
             'id' => $id,
             'class' => 'hidden',
@@ -1201,10 +1198,15 @@ protected function inputHtml(mixed $value, ?ElementInterface $element, $inline):
             ]);
         }
 
+        if ($ckeConfig->css) {
+            $html .= Html::tag('style', "#{$inputId} { $ckeConfig->css }");
+        }
+
         return Html::tag('div', $html, [
             'class' => array_filter([
                 $this->showWordCount ? 'ck-with-show-word-count' : null,
             ]),
+            'id' => $inputId,
             'data' => [
                 'element-id' => $element?->id,
                 'config' => $this->ckeConfig,

From 538a5d17aec25c9910439d09e9d55d3f40f975b4 Mon Sep 17 00:00:00 2001
From: Brian Hanson <brian@brianhanson.net>
Date: Mon, 16 Jun 2025 10:51:50 -0500
Subject: [PATCH 2/2] Use `registerCss` and namespace the ID

---
 src/Field.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Field.php b/src/Field.php
index c673c0d6..472273b7 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1199,7 +1199,7 @@ protected function inputHtml(mixed $value, ?ElementInterface $element, $inline):
         }
 
         if ($ckeConfig->css) {
-            $html .= Html::tag('style', "#{$inputId} { $ckeConfig->css }");
+            $view->registerCss("#{$view->namespaceInputId($inputId)} { $ckeConfig->css }");
         }
 
         return Html::tag('div', $html, [