Putting our theory into practice

Throughout the course of this chapter, we've covered the different parts that make up media queries as I am sure someone once said, it is time.

Yes, it's time to put this into practice. Before we start creating some real-world examples, let's create something we can use to explore the effects of adding a media query to code. We'll start by resizing some simple boxes on screen:

  1. From the code download, go ahead and extract a copy of queryexample.html and save it to our project area.
  2. In a text editor, go ahead and add the following styles; we'll start with some basic styles for our boxes:
            body { background-color: #F3ECDD; text-align: center; 
          font-family: Arial, sans-serif; color: #ffffff; 
          min-width: 33%; } 
 
        .box { width: 100%; background: #905f20; border-radius: 0.625em; 
          margin: 0; } 
 
        .box2{ min-width: 100%; background: #6b8e6f; border-radius: 
          0.625rem; 
          float: left; } 
 
        h3:after{ content: ' is less than 30rem'; }
  3. We then need to add our media query; go ahead and add this below the closing bracket of the previous style rule:
            @media screen and (min-width: 30rem) { 
          body { background-color: #C7B47C; } 
 
          .box { width: 49.5%; float: left; } 
 
          .box + .box { margin-left: 1%; margin-bottom: 0.625em;} 
 
          h3:after{ content: ' is greater than 30rem'; } 
        }
  4. Save the file as queryexample.css within the css subfolder in our project area.

If we try previewing the results of our work by running queryexample.css, we should see something akin to this screenshot:

Putting our theory into practice

Let's understand what happened here. In the core CSS (in step 3), we added three <div> elements to our markup. Since we gave them 100% width and height is set to auto by default, they'll be stacked as a series of boxes.

If we use Chrome and activate the device mode as we did before, then we can begin to see the effect of resizing the browser window. If we resize it to below 30rem in width as our breakpoint (or 480px), we can see the boxes realign and resize at the same time; the background also changes to a light brown color:

Putting our theory into practice

Now that we've seen the basics of setting up queries, let's take this a step further and create some practical examples. We'll begin with setting up a simple web page to which we will apply some simple media queries.

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