#root {
    margin: 0 auto;
    /* flex-direction: column; */
    text-align: center;
    box-sizing: border-box;
    flex-direction: column;
  }
  

  .flex-container {
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    padding: 10px;
    
  }
  
  .card {
    background: slategrey;
    margin: 1rem;
    border: 1px solid gray;
    max-width: 300px;
  }
  
  #buttons {
    margin: 0 auto;
  }

  #images {
    max-width: 960px;
    margin: 0 auto;
  }

  .img {
    width: auto;
    overflow: auto;
    margin-top: 10px;
  }

  .btn {

  }

  .card-footer {
    background:black;
    color: white;
    width: auto;
    margin-top: 5px;
    margin-bottom: 10px;
    text-align: left;
  }

  @media screen and (min-width: 600px) {
    .card {
      flex: 1 1 calc(50% - 2rem);
    }
  }
  
  @media screen and (min-width: 900px) {
    .card {
      flex: 1 1 calc(33% - 2rem);
    }
  }