style: refine PDF component layout and styles for improved presentation

- Removed unnecessary margin from the creation time display in SuitableDownloadPdf for better alignment.
- Added flexbox properties to the PDF table content for enhanced structure and height consistency.

src/components/pdf/SuitableDownloadPdf.tsx

@@ -124,7 +124,7 @@ export default function SuitableDownloadPdf() {
               </div>
             ))}
           </div>
-          <div className="pdf-intro-foot-date mt10">{createTime}</div>
+          <div className="pdf-intro-foot-date">{createTime}</div>
         </div>
       </div>
     </>

src/styles/components/_pdfview.scss

@@ -91,6 +91,9 @@
 }
 
 .pdf-table-content{
+  display: flex;
+  flex-direction: column;
+  height: 1050px;
   padding: 20px;
   margin-bottom: 50px;
 }