.slider-thumb {
  z-index: 1;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #dddddd, #ffffff);
}

@media screen and (max-width: 1280px) {
  .slider-thumb {
    display: none;
  }
}

.slider-thumb::before {
  position: absolute;
  content: "";
  left: 75%;
  top: 55%;
  transform: translate(-50%, -50%);
  width: 900px;
  height: 750px;
  background: rgba(13, 124, 102, 0.2);
  border-radius: 62% 47% 82% 35% / 45% 45% 80% 66%;
  will-change: border-radius, transform, opacity;
  animation: sliderShape 5s linear infinite;
  display: block;
  z-index: -1;
  -webkit-animation: sliderShape 5s linear infinite;
}
@keyframes sliderShape {
  0%,
  100% {
    border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
    transform: translate(-50%, -50%) translate3d(0, 0, 0) rotateZ(0.01deg);
  }
  34% {
    border-radius: 70% 30% 46% 54% / 30% 29% 71% 70%;
    transform: translate(-50%, -50%) translate3d(0, 5px, 0) rotateZ(0.01deg);
  }
  50% {
    transform: translate(-50%, -50%) translate3d(0, 0, 0) rotateZ(0.01deg);
  }
  67% {
    border-radius: 100% 60% 60% 100% / 100% 100% 60% 60%;
    transform: translate(-50%, -50%) translate3d(0, -3px, 0) rotateZ(0.01deg);
  }
}