.thumb {
    max-width:300px;
    max-height:300px;
    border-radius: 3px;
    /* box-shadow: 20px; */
    filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.7));
  }
  
  .foto {
    width:33.33%;
    border:0px dotted lightgrey;
    padding:-2px;
    /* margin:2px; */
    margin: 0 auto;
    text-align: center;
  }
  .foto h2 {
    font-family: Oswald;
    letter-spacing: 0px;
  }
  .principal {
    display: flex;
    flex-wrap: wrap;
  }