How do I combine css border & padding into the width and height?

hoodedvul

To do this you can use the box-sizing CSS property.

The CSS code for content with borders and padding.

    <style>
        .box1 {
            width: 500px;
            height: 50px;
            border: 2px solid brown;
        }
        .box2 {
            width: 500px;
            height: 50px;
            padding: 50px;
            border: 2px solid green;
        }
    </style>

The demo HTML.

 ...
    <div class="box1">I'm inside box1 get me out of here!</div>
    <br>
    <div class="box2">I'm inside box2 get me out of here!</div>
...

The result is different width and height sizes because of the padding.

To combine the padding and the border into the width and height we use box-sizing: border-box

The CSS code is now:

 <style>
        .box1 {
            width: 500px;
            height: 50px;
            border: 2px solid brown;
            box-sizing: border-box
        }
        .box2 {
            width: 500px;
            height: 50px;
            padding: 50px;
            border: 2px solid green;
            box-sizing: border-box
        }
    </style>

The result is: