.marco {
  width: 20%;
  border:2px solid #ddd;
  border-radius:8px;
  padding:10px;
margin:15px;
}

.marco img{
// display:block;
 width:100%;
   height:200px;
}

.marco span{ 
  display:block;
  margin:0;
  background:#646464;
  color:white;
  font-style:italic;
  padding:5px;
  text-align:center;
}

.galeria{
    display:flex;
  flex-wrap:wrap;
  margin:20px;
}