diff --git a/push.py b/push.py
index ed6d5f5..52c0678 100644
--- a/push.py
+++ b/push.py
@@ -83,19 +83,21 @@ def smtp(send_title, push_message):
     import smtplib
     from email.mime.text import MIMEText
 
+    IMAGE_API = "http://api.iw233.cn/api.php?sort=random&type=json"
+
     try:
-        image_url = http.get("https://iw233.cn/api.php?sort=random&type=json").json()["pic"][0]
+        image_url = http.get(IMAGE_API).json()["pic"][0]
     except:
         image_url = "unable to get the image"
         log.warning("获取随机背景图失败，请检查图片api")
     with open("assets/email_example.html", encoding="utf-8") as f:
         EMAIL_TEMPLATE = f.read()
-    message = EMAIL_TEMPLATE.format(title=send_title, message=push_message.replace("\n", "<br/>"), image_url = image_url)
+    message = EMAIL_TEMPLATE.format(title=send_title, message=push_message.replace("\n", "<br/>"), image_url=image_url)
     message = MIMEText(message, "html", "utf-8")
     message['Subject'] = cfg["smtp"]["subject"]
     message['To'] = cfg["smtp"]["toaddr"]
     message['From'] = f"{cfg['smtp']['subject']}<{cfg['smtp']['fromaddr']}>"
-    if cfg.getboolean("smtp","ssl_enable"):
+    if cfg.getboolean("smtp", "ssl_enable"):
         server = smtplib.SMTP_SSL(cfg["smtp"]["mailhost"], cfg.getint("smtp", "port"))
     else:
         server = smtplib.SMTP(cfg["smtp"]["mailhost"], cfg.getint("smtp", "port"))