.border{
  width: 100px;
  height: 100px;
  background-color: var(--grey1);
  
  border-style: solid;
  border-color: green;
  border-width: 6px;
  
  border-top-left-radius: 20px;
  border-top-right-radius: 40px;
  border-bottom-right-radius: 60px;
  border-bottom-left-radius: 80px;
}

body{
  background-color: rgb(30,30,30);
  color: white;
  font-family: verdana;
}

:root{
  --grey1: rgb(60,60,60);
  --grey2: rgb(90,90,90);
  --grey3: rgb(120,120,120);
}