Struggling with last two items for Tribute Page

Having trouble with last two items for tribute page if anyone can offer guidance. Below is what I have so far.

<style>
.responsive-img {
max-width: 100%;
height: auto;
  margin: 0 auto;

}
</style>

<img class="responsive-img" src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Mrs_Kennedy_in_the_Diplomatic_Reception_Room_cropped.jpg/440px-Mrs_Kennedy_in_the_Diplomatic_Reception_Room_cropped.jpg" >

Please post all your code or better yet a link to your Codepen.

If you click the red button and read all of the error message it should tell you what is missing.