diff --git a/src/PhpSpreadsheet/Writer/Html.php b/src/PhpSpreadsheet/Writer/Html.php
index 53cd86bea..5c907149e 100644
--- a/src/PhpSpreadsheet/Writer/Html.php
+++ b/src/PhpSpreadsheet/Writer/Html.php
@@ -1360,7 +1360,7 @@ class Html extends BaseWriter
      * @param null|Cell|string $cell
      * @param array|string $cssClass
      */
-    private function generateRowCellData(Worksheet $worksheet, $cell, &$cssClass, string $cellType): string
+    private function generateRowCellData(Worksheet $worksheet, $cell, &$cssClass): string
     {
         $cellData = ' ';
         if ($cell instanceof Cell) {
@@ -1384,14 +1384,10 @@ class Html extends BaseWriter
                 $cssClass .= ' style' . $cell->getXfIndex();
                 $cssClass .= ' ' . $cell->getDataType();
             } elseif (is_array($cssClass)) {
-                if ($cellType == 'th') {
-                    if (isset($this->cssStyles['th.style' . $cell->getXfIndex()])) {
-                        $cssClass = array_merge($cssClass, $this->cssStyles['th.style' . $cell->getXfIndex()]);
-                    }
-                } else {
-                    if (isset($this->cssStyles['td.style' . $cell->getXfIndex()])) {
-                        $cssClass = array_merge($cssClass, $this->cssStyles['td.style' . $cell->getXfIndex()]);
-                    }
+                $index = $cell->getXfIndex();
+                $styleIndex = 'td.style' . $index . ', th.style' . $index;
+                if (isset($this->cssStyles[$styleIndex])) {
+                    $cssClass = array_merge($cssClass, $this->cssStyles[$styleIndex]);
                 }
 
                 // General horizontal alignment: Actual horizontal alignment depends on dataType
@@ -1511,7 +1507,7 @@ class Html extends BaseWriter
             [$cell, $cssClass, $coordinate] = $this->generateRowCellCss($worksheet, $cellAddress, $row, $colNum);
 
             // Cell Data
-            $cellData = $this->generateRowCellData($worksheet, $cell, $cssClass, $cellType);
+            $cellData = $this->generateRowCellData($worksheet, $cell, $cssClass);
 
             // Hyperlink?
             if ($worksheet->hyperlinkExists($coordinate) && !$worksheet->getHyperlink($coordinate)->isInternal()) {
diff --git a/tests/PhpSpreadsheetTests/Writer/Html/Issue3678Test.php b/tests/PhpSpreadsheetTests/Writer/Html/Issue3678Test.php
new file mode 100644
index 000000000..5c0a7cd02
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Html/Issue3678Test.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Html;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Fill;
+use PhpOffice\PhpSpreadsheet\Writer\Html;
+use PHPUnit\Framework\TestCase;
+
+class Issue3678Test extends TestCase
+{
+    public function testInlineAndNot(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->getCell('A1')->setValue(1);
+        $styleArray = [
+            'fill' => [
+                'fillType' => Fill::FILL_SOLID,
+                'color' => ['rgb' => 'FFFF00'],
+            ],
+        ];
+        $sheet->getStyle('A1')->applyFromArray($styleArray);
+        $style1 = "vertical-align:bottom; border-bottom:none #000000; border-top:none #000000; border-left:none #000000; border-right:none #000000; color:#000000; font-family:'Calibri'; font-size:11pt; background-color:#FFFF00";
+        $style2 = $style1 . '; text-align:right; width:42pt';
+        $writer = new Html($spreadsheet);
+        $html = $writer->generateHtmlAll();
+        self::assertStringContainsString('td.style1, th.style1 { ' . $style1 . ' }', $html);
+        self::assertStringContainsString('<td class="column0 style1 n">1</td>', $html);
+        self::assertStringContainsString('table.sheet0 col.col0 { width:42pt }', $html);
+        self::assertStringContainsString('.n { text-align:right }', $html);
+        $writer->setUseInlineCss(true);
+        $html = $writer->generateHtmlAll();
+        self::assertStringContainsString('<td style="' . $style2 . '">1</td>', $html);
+        $spreadsheet->disconnectWorksheets();
+    }
+}