How to Create Rounded Corners for both the Inside and Outside of a Box with a Border?

How to Make Round Corners for Both Inside and Outside of a Box and Its Border

Your question highlights the challenge of achieving rounded corners for both the inner box and its border. To address this, we'll delve into the technical aspects of CSS and JavaScript.

Inner Border Calculations

To enable rounded corners for the inner box, you'll need to adjust the background-clip property to border-box, which is the default setting.

Additionally, the inner border radius is calculated by subtracting the border width from the outer border radius. If the border width is greater than the border radius, the inner border radius becomes negative, resulting in awkward corners. Therefore, you'll need to manually calculate the inner border radius.

In your case, the inner border radius would be:

6px - 5px = 1px

Applying Border Radii

With the inner border radius calculated, you can update your CSS:

.radius-all { border-radius: 6px; -moz-border-radius: 6px; -webkit-border-radius: 6px; }
.template-bg { background: #FFF; }
.template-border { border: 5px solid rgba(255, 255, 255, 0.2); }

Adding Color Overlays with JavaScript

To apply a color overlay to the header, you can use JavaScript:

// Get the background color of the body element
var bodyBgColor = document.getElementsByTagName('body')[0].style.backgroundColor;;

// Convert hexadecimal color to RGB (subject to implementation)

// Create a new element for the header
var header = document.createElement('header');

// Set the background color of the header
header.style.backgroundColor = bodyBgColor;

General Border Application

If you're using a separate box for the border, apply border-radius to both the border and inner boxes. Alternatively, you can set the inner box to manage its own border, simplifying the code.

By applying these techniques, you can achieve rounded corners for both the inner box and its border.

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