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

/* Header/Blog Title */
.header {
  padding: 30px;
  font-size: 40px;
  text-align: center;
  background: #3c3d3e;
}
img{
  width: 100%;
}

/* 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;
}

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

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


.row{
  padding:20px;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}
/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: #f1f1f1;
  cursor: pointer;
}

.btn:hover {
  background-color: #ddd;
}

.btn.active {
  background-color: #666;
  color: white;
}

/*Couleur*/
.couleur_ccc{background: #ccc;}
.couleur_ddd{background: #ddd;}

/*Lien Titre articles*/
div .column a{
  text-decoration: none;
}

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