Highlight Border Animation

.highlight-card {
  width: 350px;
  height: 200px;
  background: #121212;
  border-radius: 12px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 24px;
  font-weight: 600;
  overflow: hidden;
}
.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 2px solid transparent;
  border-radius: 12px;
  background: linear-gradient(45deg, #76ff03, #00e676) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.highlight-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right, 
    transparent, 
    rgba(255, 255, 255, 0.2), 
    transparent
  );
  transform: rotate(45deg);
  animation: highlight-slide 3s infinite linear;
}
@keyframes highlight-slide {
  0% { transform: rotate(45deg) translateX(-100%); }
  100% { transform: rotate(45deg) translateX(100%); }
}