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console

            
<div class="dynamic-shadow"></div>

            
.dynamic-shadow {
  position: relative;
  width: 150px;
  height: 150px;
  background: linear-gradient(75deg, #6d78ff, #00ffb8);
  z-index: 1;
}

.dynamic-shadow::after {
  content: '';
  width: 100%;
  height: 100%;
  position: absolute;
  background: inherit;
  top: 0.5rem;
  filter: blur(0.4rem);
  opacity: 0.7;
  z-index: -1;
}