added jpg

index.html

 
         <div class="advertisementLinkContents__left">
           <a href="http://www.creavision.co.jp/" target="_blank">
-            <img src="css/img/bannar2/creavision20230401.png" alt="creavision" class="advertisementLinkImg" />
+            <img src="css/img/bannar2/creavision20230401.jpg" alt="creavision" class="advertisementLinkImg" />
           </a>
         </div>
         <!-- <div class="advertisementLinkContents__center">
       <!--TODO 2019年12月1日から掲載-->
       <span>
         <a href="http://www.creavision.co.jp/" target="_blank">
-          <img src="css/img/bannar2/creavision20230401.png" alt="creavision" width="150" height="50" border="0" />
+          <img src="css/img/bannar2/creavision20230401.jpg" alt="creavision" width="150" height="50" border="0" />
         </a>
       </span>