Create a dialog box with rounded triangle corners

In the process of developing an application, we are incorporating a text display feature within a div that resembles a chat box direction, but with a curved style as depicted in the screenshot linked below.

Desired design exemplified in purple

Target design

Initially, I was able to create a dialog box with a straight edge following the CSS code provided below:

.big{
    width: 300px;
    height: 80px;
    background-color: #000000;
    box-shadow: 0 0 20px rgba(0, 0, 0, .3);
    position: relative;
    border-radius: 6px;
}
  
.big::after {
    content: '';
    position: absolute;
    visibility: visible;
    top: 0px;
    right: -50px;
    border: 50px solid transparent;
    border-top: 30px solid #000;
    clear: both;
}

My question is how do I implement the curved design into our current layout?

Current layout

Answer №1

Consider implementing a design like the one below.

.big {
  --bg-color: steelblue;

  width: 300px;
  height: 80px;
  background-color: var(--bg-color);
  filter: drop-shadow(0 0 4px rgba(0, 0, 0, .3));
  position: relative;
  border-radius: 6px;
  border-top-right-radius: 0;
}

.big::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  transform: translateX(100%);
  height: 50%;
  aspect-ratio: 1/1;
  background-image: radial-gradient(farthest-side at bottom right, transparent 100%, var(--bg-color) calc(100% + 1px));
}
<div class="big"></div>

This method employs a radial-gradient instead of utilizing a border to create the curved shape.

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