* {
  box-sizing: border-box;
  text-align: center;
}
/* Add a gray background color with some padding */
body {
  font-family: Arial;
  margin:0;
  background: #f1f1f1;
  text-align: center;
}

/* Header/Blog Title */
.header {
  padding: 30px;
  font-size: 40px;
  text-align: center;
  background: #3c3d3e;
}

/* Footer */
.footer {
  padding: 20px;
  text-align: center;
  background: #ddd;
  margin-top: 20px;
}

/* Create two equal columns that floats next to each other */
.column {
  float: left;
  width: 33%;
  padding: 10px;
}

.columnBis {
  float: left;
  width: 49%;
  padding: 10px;
}
.columnBisBis {
  float: left;
  width: 49%;
  padding: 10px;
}

@media only screen and (max-width: 720px){
.column {
  width: 100%;
}
.columnBis {
  width: 100%;
}
.columnBisBis {
  width: 100%;
}
#btnContainer{display: none;}
}

@media (min-width: 720px){
.column {
  width: 33%;
}
.columnBis {
  width: 49%;
}
.columnBisBis {
  width: 100%;
}
}


.row{
  padding:20px;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}


/*Titre article*/
div .column h1{
  text-align: center;
  color: black;
}

.img3ds{
  width: 200px;
  height: 200px;
}

.imgswitch{
  width: 200px;
  height: 320px;
}

.Filtrenoir{
  filter : brightness(40%);
}