body {
    display: flex;
    flex-direction: column;
}

.titre-portfolio {
    text-align: center;
    font-size: 60px;
    font-family: Playfair Display, serif;
    margin: 70px 0 70px;
    color: #000;
}

.grille-portfolio {
    width: 90%;
    min-width: 300px;
    max-width: 1700px;
    height: auto;
    margin: 30px auto;
    display: grid;
    grid-template-columns: repeat(auto-fill,400px);
    justify-content: center;
}

.grid-item{
    height: 250px;
    cursor: pointer;
    position: relative;
    margin: 30px 15px;
}

.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: 60%;
    height:700px;
    object-fit: cover;
    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;

    }
}