body {
  display: flex;
  flex-direction: column;
}
.titre-portfolio {
  text-align: center;
  font-size: 60px;
  font-family: 'Pacifico', cursive, serif;
  margin: 70px 0 70px;
  color: #000;
}
.grille-portfolio {
  width: 90%;
  max-width: 1200px;
  min-width: 300px;
  height: auto;
  margin: 30px auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, 200px);
  justify-content: center;
}
.grid-item {
  height: 250px;
  cursor: pointer;
  position: relative;
  margin: 10px 10px;
}
.grid-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}
.description {
  position: absolute;
  top: -25px;
  left: 0px;
  font-size: 18px;
}
.prix {
  position: absolute;
  top: -27px;
  right: 0px;
  font-size: 23px;
  font-weight: bold;
}

@media screen and (max-width: 550px) {
  .grille-portfolio {
    grid-template-columns: repeat(auto-fill, 300px);
  }
  h1 {
    font-size: 30px;
  }
}

/* Slider */

.slider-portfolio {
  width: 100%;
  height: 100%;
  position: fixed;
  z-index: 1000;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(45deg, #333, #000);
  display: none;
}
.btn-fermer-slider {
  position: absolute;
  top: 3%;
  right: 2%;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  font-size: 30px;
  outline: none;
  border: none;
  background: #000;
  color: #fff;
  border: 1px solid #fff;
}
.btn-left,
.btn-right {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 70px;
  height: 70px;
  border-radius: 50%;
  font-size: 30px;
  outline: none;
  border: none;
  display: flex;
  justify-content: center;
  align-items: center;
}
.btn-left {
  left: 2%;
}
.btn-right {
  right: 2%;
}
.btn-left img,
.btn-right img {
  width: 30px;
  height: 30px;
}

.img-visible-slider {
  width: 85%;
  height: 800px;
  object-fit: contain;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
@media screen and (max-width: 700px) {
  .btn-fermer-slider {
    width: 50px;
    height: 50px;
    font-size: 25px;
  }
  .btn-left,
  .btn-right {
    width: 40px;
    height: 40px;
  }
  .btn-left img,
  .btn-right img {
    width: 20px;
    height: 20px;
  }
  .img-visible-slider {
      width: 95%;
      height: 500px;
  }
}