.gradual-fade {

  background-size: cover;
  background-position: center;
  position: relative;
  border-radius: 50% 0 / 50% 100%;
}

.gradual-fade::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-image: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%);
  border-radius: 50% 0 / 50% 100%;
}