Rounds divided button

body {
  box-sizing: border-box;
  margin: 0;
}

nav {
  display: inline-block;
  margin: 30px;
  background-color: #252525;
  font-family: sans-serif;
  border-radius: 50px;
}

nav a {
  display: inline-flex;
  font-size: 20px;
  width: 100px;
  background-color: #5543D2;
  color: white;
  padding: 25px;
  justify-content: center;
}

nav a:first-child {
  border-top-left-radius: 50px;
  border-bottom-left-radius: 50px;
  justify-content: flex-start;
  clip-path: polygon(0 0, 100% 0%, 75% 100%, 0% 100%);
}

nav a:not(:first-child) {
  border-top-right-radius: 50px;
  border-bottom-right-radius: 50px;
  justify-content: flex-end;
  clip-path: polygon(25% 0, 100% 0%, 100% 100%, 0% 100%);
  margin-left: -38px;
}