How to Create Rounded Corners for Both the Inside and Border of a Box?

Creating Rounded Corners for Inside of a Box and Its Border

In web design, adding rounded corners to both the inside of a box and its border can enhance the visual appeal of an element.

Calculating Inner Border Radius

To create rounded corners for the inner box, determine the inner border radius. It is calculated as the difference between the outer border radius and the border width:

inner_border_radius = outer_border_radius - border_width

For example, if the outer border radius is 10px and the border width is 5px, the inner border radius would be 5px.

Adjusting CSS Properties

In the CSS code provided, you can remove the vendor-specific background-clip properties (-moz-background-clip and -webkit-background-clip) or set them to border-box to achieve the inner border radius. Additionally, update the inner border radius using the calculation mentioned above.

Code Snippet:

.radius-all {
  border-radius: 10px;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
}

.template-bg {
  background: #FFF;
}

.template-border {
  border: 5px solid rgba(255, 255, 255, 0.2);
}

Additional Considerations:

• If the border width is wider than the outer border radius, the inner border radius will become negative, resulting in inverted corners.
• You can apply rounded borders to individual boxes or create a CSS class to make it easier to apply to multiple elements.
• JavaScript can be used to add color overlays to the header and easily obtain the body background color in hexadecimal format for consistency.

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