diff --git a/chat.php b/chat.php
index 5a07afe..945fba2 100644
--- a/chat.php
+++ b/chat.php
@@ -35,9 +35,9 @@ function show_messages()
             $d = new DateTime($message['msgdate']);
             $m = htmlspecialchars($message['msg']);
             if ($message['type'] == 'sys') { /* Системка */
-                echo sprintf("<span style='color:maroon;background:#faa;'>%s %s</span>", $d->format('H:i'), $m) . PHP_EOL;
+                echo sprintf('<span style="color:maroon;background:#faa;">%s %s</span>', $d->format('H:i'), $m) . PHP_EOL;
             } elseif ($message['type'] == 'sms') { /* Телеграмма */
-                echo sprintf("<span style='color:darkgreen;background:#afa;'>[Телеграмма]: %s %s</span>", $d->format('H:i'), $m) . PHP_EOL;
+                echo sprintf('<span style="color:darkgreen;background:#afa;">[Телеграмма]: %s %s</span>', $d->format('H:i'), $m) . PHP_EOL;
             } else {
                 echo sprintf('%s [%s]: %s', $d->format('H:i'), $message['from'], $m) . PHP_EOL;
             }