You could do that using an image editor, but CSS can often get the job done faster. Learn how to add a CSS reference to an image and you can stretch it horizontally to any width you like.

Ryan Boudreaux includes all the code snippets you'll need in this demo of how to create an image hover-preview effect using HTML, CSS, and JavaScript.

Then, add images to the page. Make sure the photos are big enough for people to see easily. ... As you continue learning HTML, CSS and JavaScript, keep practising and experimenting.