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.div {
border-radius: 15px 50px 30px 5px; /*TL TR BR BL*/
border-radius: 15px 50px 30px; /*TL TRBL BR*/
border-radius: 15px 50px; /*TLBR TRBL*/
border-radius: 15px; /*All corners*/
}
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div {
border-top-right-radius: 40%;
background-color: lightgreen;
border: solid 2px black;
width: 100px;
height: 100px;
}