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border-radius allows you to create rounded corners in CSS.
border-radius.
The red area is a 20x20px box that shows how border-radius works: the radius starts 20px left and down from the normal corner.
Testsheet:
div.test {
border: 1px solid black;
padding: 10px;
position: relative;
border-radius: 20px;
border-bottom-right-radius: 0;
}
The bottom right does not have a border-radius.