style.css

body {
    font-family: Open Sans, sans-serif;
  }
  
  header {
    height: 100px;
    border-bottom: 1px solid #000;
    margin-bottom: 40px;
  }
  
  @media (max-width: 768px) {
    header {
         margin-bottom: 20px;
         height: 200px;
    }
}

  h1 {
    text-transform: uppercase;
    margin-bottom: 0;
  }

  @media (max-width: 768px) {
    h1 {
         font-size: 36px;
    }
}
  
  section {
    margin: 0 auto;
    display: block;
    max-width: 1024px;
    width: 100%;
  }
  
  .card {
    display: inline-block;
    margin: 10px;
    border: 1px solid #000;
    vertical-align: top;
    max-height: 100%;
  }
  
  @media (max-width: 768px) {
    .card {
         display: block;
         margin: 20px 10px;
    }
}

  .card img {
    display: block;
    width: 300px;
    height: 300px;
  }
  @media (max-width: 768px) {
    .card img {
         width: 100%;
         height: 100%;
    }
  
  .card details {
    width: 300px;
    height: auto;
    display: inline-block;
  }
}  
@media (max-width: 768px) {
    .card details {
         width: 100%;
    }
}

  .card details summary {
    font-size: 18px;
    padding: 10px;
  }
  
  @media (max-width: 768px) {
    .card details summary {
         font-size: 16px;
    }
}

  .card details p {
    padding: 0 10px;
  }
   
  @media (max-width: 768px) {
    .card details p {
         font-size: 14px;
    }
}

  .card details blockquote {
    color: #777;
    font-style: italic;
  }