How to Create a Transparent Curved Shape with Rounded Sides in CSS?

How to Create a Transparent Curved Shape with Rounded Sides Using CSS

In web development, creating visually appealing and functional elements is crucial. A common shape used in menus and other UI elements is a curved shape with two rounded sides. However, achieving this transparent shape can be challenging.

Challenge

You're attempting to create a transparent inner curved shape, but you're facing difficulty rendering a clear background. The shape you're aiming for resembles the image shown in https://i.sstatic.net/LFEA9.png.

Previous Solution

Initially, you tried using CSS to create the shape, but the background remained opaque, obscuring the underlying page content. Here's the code you used:

.tab-indicator {
  background-color: #000000;
  border-radius: 50px 0 0 50px;
  ...
}

Improved Solution

To create a transparent curved shape with rounded sides, you can utilize the updated solution provided via https://css-shape.com/inner-curve/. This solution offers a customizable CSS generator that allows you to fine-tune various parameters and generate the desired shape.

Alternative Approach

Another approach involves using radial-gradients to achieve a similar effect:

.top:before,
.top:after {
  background:
    radial-gradient(100% 50% at top left, #fff 98%,transparent 100%) right,
    radial-gradient(100% 50% at bottom right, transparent 98%,#fff 100%) left;
  ...
}

This technique generates radial gradients that intersect, creating the illusion of a transparent curved shape.

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