.box_description h2,.box_lien h2{
  color: white;
  font-size: 1.5vw;
  display: block;
  text-align: center;
}

.box_description a,.box_lien a{
  color: orange;
  font-size: 14px;
  display: block;
  text-align: center;
}

p{
  font-size: 16px;
  text-align: justify;
}

.collapsible {
    background-color: #777;
    color: black;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: center;
    outline: none;
    font-size: 20px;
    font-weight: bold;
    border-bottom: 1px solid white;
}

.active, .collapsible:hover{
    background-color: #555;
    color: white;
}

.content {
    display: none;
    overflow: hidden;
    background-color: #f1f1f1;
    transition:all 2s;
}

/********************************/
* {
  box-sizing: border-box;
}
.bg-image,.bg-image1,.bg-image2,.bg-image3,.bg-image4,.bg-image5,.bg-image6,.bg-image7,.bg-image8,.bg-image9{
  width: 100%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.bg-image{background-image: url("/photos/fond4.jpg");}
.bg-image1{background-image: url("/photos/sol2.jpg");}
.bg-image2{background-image: url("/photos/fond3.jpg");}
.bg-image3{background-image: url("/photos/industrie.jpg");}
.bg-image4{background-image: url("/photos/mine.jpg");}
.bg-image5{background-image: url("/photos/polution.jpg");}
.bg-image6{background-image: url("/photos/2010.jpg");}
.bg-image7{background-image: url("/photos/fond9b.jpg");}
/* Position text in the middle of the page/image */
.bg-text {
  padding: 15px;
 width: 100%;
 background-color: rgba(0,0,0,0.7);
 color: white;
}
.boxEvenements,.boxEvenements2{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.box_img{
  padding: 10px 20px;
  max-width: 650px;
  margin: auto;
}

.box_description{
  width: 48%;
  margin: auto;
}

.box_lien{
  width: 80%;
  margin: auto;
}

.p2018{
   width: 100%;
   height: auto;
   padding: 12px;
  transform: perspective(1000px) rotateY(40deg);
}

.p2018-2{
   width: 100%;
   height: auto;
   padding: 12px;
  transform: perspective(1000px) rotateY(-40deg);
}


.divDec{
  margin: auto;
  text-align: center;
  max-width: 300px;
}

a.buttonDecouvrir{
  color: white;
  background-color: black;
  font-size: 25px;
  padding: 10px 30px;
  border: 1px red solid;
  border-radius: 70px 70px 70px 70px;
  transition: all 0.2s;
}

.buttonDecouvrir:hover{
  text-decoration: none;
  color: white;
}

.buttonDecouvrir span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.3s;
}

.buttonDecouvrir span:after {
  content: '\00bb';
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
}

.buttonDecouvrir:hover span {
  padding-right: 25px;
}

.buttonDecouvrir:hover span:after {
  opacity: 1;
  right: 0;
}

@media screen and (max-width: 1296px) {
  p{font-size: 13px;}
    .box_img{max-width: 500px;}
}

@media screen and (max-width: 1000px) {

  .box_description h2,.box_lien h2{font-size: 16px;}

  p{font-size: 12px;}

    .boxEvenements{
      flex-direction: column;
    }

    .boxEvenements2{flex-direction: column-reverse;}

    .box_img{max-width: 400px;}

  .box_description{width: 80%;}
}

@media screen and (max-width: 500px) {
  .box_img{max-width: 200px;}
  .p2018,.p2018-2{padding:2px;}
  .box_img{padding: 2px;}
  .box_description{width: 95%;}
  .box_description h2,.box_lien h2{font-size: 13px;}
  p{font-size: 10px;}

  .divDec{max-width: 150px;}
  a.buttonDecouvrir{font-size: 15px;padding: 10px 10px;}
  a.buttonDecouvrir:hover span {
  padding-right: 8px;
}

/********************************/