<div class="el"></div>

.el {
  position: relative;
  padding: 50px 100px;
  border-radius: 15px;
  background-image: linear-gradient(to right, green calc(100% - 70px), blue);

  &::after {
    content: '';
    position: absolute;
    top: 100%;
    right: 0;
    width: 100%;
    height: 29px;
  background-image: linear-gradient(to right, green calc(100% - 70px), blue);
    clip-path: polygon(calc(100% - 108px) 0, calc(100% - 18px) 0, 100% 100%);
  }
}