.using-heading {
  font-family: "Roboto", sans-serif;
  font-weight: 600;
  font-size: 2.25rem;
  line-height: 48px;
  letter-spacing: 4%;
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;

  &::before {
    content: '';
    width: 100px;
    height: 8px;
    background-color: var(--line-before);
    display: block;
  }
}



.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  border-top: 1px solid #c9c8c8;
  border-bottom: 1px solid #c9c8c8;
  padding: 20px 15px;
}

.flip-card {
  height: 180px;
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  transition: transform 1.4s ease;
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
  transform: rotateX(180deg);
}

.flip-card-front,
.flip-card-back {
  backface-visibility: hidden;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flip-card-front {
  background-color: #bad3f2;
}


.flip-card-back {
  background-color: #131313;
  transform: rotateX(180deg);

  img {
    filter: invert(1);
  }
}

main {
  background-image: none;
}