Update tpl_edit_tag.htm

src/admin/templets/tpl_edit_tag.htm

@@ -73,7 +73,7 @@
 					<td colspan="2"><textarea id="content" name="content" cols="150" rows="24" style="width:98%;height:450px"><?php echo $democode; ?></textarea></td>
 				</tr>
 				<tr>
-					<td bgcolor="#f8f8f8" colspan="2" class="py-3">
+					<td bgcolor="#f8f8f8" colspan="2" align="center" class="py-3">
 						<button type="submit" name="B1" class="btn btn-success btn-sm">保存</button>
 						<button type="button" name="B4" class="btn btn-success btn-sm" onClick="javascript:history.go(-1);">返回</button>
 					</td>