img {
  -o-object-fit: cover;
     object-fit: cover;
}

/* Portfolio Section Style */
.portfolio {
  padding: 3rem 0 1.5rem;
}
.portfolio__title {
  font-size: 3rem;
  line-height: 1;
}
.portfolio__nav__btn {
  font-size: 1.3rem;
  font-weight: 400;
  padding: 0.4rem 1rem;
}
.portfolio__nav__btn::before, .portfolio__nav__btn::after {
  content: "";
  position: absolute;
  left: 0;
  transform: scaleX(0);
  width: 100%;
  height: 2px;
  background-color: #d9d9d9;
  transition: transform ease-in-out 0.3s;
}
.portfolio__nav__btn::before {
  top: 0;
  transform-origin: left center;
}
.portfolio__nav__btn::after {
  bottom: 0;
  transform-origin: right center;
}
.portfolio__nav__btn.active::before, .portfolio__nav__btn.active::after, .portfolio__nav__btn:hover::before, .portfolio__nav__btn:hover::after, .portfolio__nav__btn:focus::before, .portfolio__nav__btn:focus::after {
  transform: scaleX(1);
}
.portfolio__nav__btn.active::before, .portfolio__nav__btn:hover::before, .portfolio__nav__btn:focus::before {
  transform-origin: right center;
}
.portfolio__nav__btn.active::after, .portfolio__nav__btn:hover::after, .portfolio__nav__btn:focus::after {
  transform-origin: left center;
}
.portfolio__card {
  margin-bottom: 1.5rem;
}
.portfolio__card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent);
  opacity: 0;
  transition: opacity linear 0.3s;
}
.portfolio__card:hover::after, .portfolio__card:focus::after {
  opacity: 1;
}