How Can I Create Rounded Corners for Inner Boxes and Borders?

Achieving Rounded Corners for Inner Boxes and Borders

Understanding the Issue

The goal is to create a box with rounded corners and a border that also has rounded borders. The background-clip property can be used to achieve the rounded corners for the border. However, the inner box remains rectangular.

Achieving Inner Box Rounded Corners

To round the corners of the inner box, the border-radius property can be used. The inner border radius is calculated as the difference between the outer border radius and the border width. Therefore, the inner border radius becomes:

inner border radius = outer border radius - border width

If the border width is greater than the border radius, the inner border radius becomes negative, resulting in inverted corners. Therefore, the border width should be considered when calculating the inner border radius.

Modifying the Code

In the provided code, the border width is 5px and the outer border radius is 10px. Using the formula above, the inner border radius becomes:

inner border radius = 10px - 5px = 5px

The modified CSS becomes:

.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

• To avoid rounded corners on the outer border, the -vendor-background-clip properties should be set to border-box.
• Color overlays can be applied in JavaScript using methods that convert hex color codes to decimal values and perform necessary calculations to decrease opacity.
• Rounded borders can be applied to both the inner and outer boxes by using separate box elements or by creating a border directly on the inner box.
• A rounded-borders class can be created to apply rounded borders to multiple boxes efficiently.

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