fix(PicAuthCodeModal): Optimize the image captcha style and improve the automatic refresh of the captcha.

ui/src/components/Modal/PicAuthCodeModal.tsx

@@ -45,7 +45,7 @@ const Index: React.FC<IProps> = ({
       <Modal.Body>
         <Form noValidate onSubmit={clickSubmit}>
           <Form.Group controlId="code" className="mb-3">
-            <div className="mb-3">
+            <div className="mb-3 p-2 d-flex align-items-center justify-content-center bg-light rounded-2">
               <img
                 src={imgCode?.captcha_img}
                 alt="code"

ui/src/pages/Users/Register/components/SignUpForm/index.tsx

@@ -135,6 +135,7 @@ const Index: React.FC<Props> = ({ callback }) => {
           }
           setFormData({ ...data });
         }
+        getImgCode();
       });
   };