#portfolio-flters li {
  display: inline-block;
  font-weight: 500;
  color: var(--dark);
  cursor: pointer;
  transition: .5s;
  border-bottom: 2px solid transparent;
}

#portfolio-flters li:hover,
#portfolio-flters li.active {
  color: var(--primary);
  border-color: var(--primary);
}

.portfolio-item img {
  transition: .5s;
}

.portfolio-item:hover img {
  transform: scale(1.1);
}

.portfolio-item .portfolio-overlay {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 0;
  height: 0;
  bottom: 0;
  left: 50%;
  background: rgba(70, 71, 70, 0.7);
  transition: .5s;
}

.portfolio-item:hover .portfolio-overlay {
  width: 100%;
  height: 100%;
  left: 0;
}

.portfolio-item .portfolio-overlay .btn {
  opacity: 0;
}

.portfolio-item:hover .portfolio-overlay .btn {
  opacity: 1;
}