instruction: Create a Dockerfile for fundamentals
output: ```dockerfile
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  const GREETINGS = [
   "Whalecome!",
   "All hands on deck!",
   "Charting the course ahead!",
  ];
  
  module.exports = async (req, res) => {
   res.send({
   greeting: GREETINGS[ Math.floor( Math.random() * GREETINGS.length )],
   });
  };If you haven't done so yet, save the file. If you refresh your browser, you should see a new greeting. If you keep refreshing, you should see all of the messages appear.
  Change the placeholder textWhen you look at the app, you'll see the placeholder text is simply "New Item". Youâll now make that a little more descriptive and fun. Youâll also make a few changes to the styling of the app too.Open the client/src/components/AddNewItemForm.jsx file. This provides the component to add a new item to the to-do list.Modify the placeholder attribute of the Form.Control element to whatever you'd like to display.
  
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  <Form.Control
   value={newItem}
   onChange={(e) => setNewItem(e.target.value)}
   type="text"
   placeholder="What do you need to do?"
   aria-label="New item"
  />Save the file and go back to your browser. You should see the change already hot-reloaded into your browser. If you don't like it, feel free to tweak it until it looks just right.
  Change the background colorBefore you consider the application finalized, you need to make the colors better.Open the client/src/index.scss file.Adjust the background-color attribute to any color you'd like. The provided snippet is a soft blue to go along with Docker's nautical theme.If you're using an IDE, you can pick a color using the integrated color pickers. Otherwise, feel free to use an online Color Picker.
  
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  body {
   background-color: #99bbff;
   margin-top: 50px;
   font-family: 'Lato';
  }Each save should let you see the change immediately in the browser. Keep adjusting it until it's the perfect setup for you.
  And with that, you're done. Congrats on updating your website.RecapBefore you move on, take a moment and reflect on what happened here. Within a few moments, you were able to:Start a complete development project with zero installation effort. The containerized environment provided the development environment, ensuring you have everything you need. You didn't have to install Node, MySQL, or any of the other dependencies directly on your machine. All you needed was Docker Desktop and a code editor.Make changes and see them immediately. This was made possible because 1) the processes running in each container are watching and responding to file changes and 2) the files are shared with the containerized environment.Docker Desktop enables all of this and so much more. Once you start thinking with containers, you can create almost any environment and easily share it with your team.Next stepsNow that the application has been updated, youâre ready to learn about packaging it as a container image and pushing it to a registry, specifically Docker Hub.Build and push your first image
  Request changesTable of contentsExplanationTry it outStart the projectWhat's in the environment?Make changes to the appChange the greetingChange the placeholder textChange the background colorRecapNext steps
  
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