* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  #wrapper
{
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
}
  
  .container {
    height: 100px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .container h1 {
    margin: 20px 100px;
    text-align: center;
    margin-bottom: 20px;
    font-size: 3rem;
  }
  
  /* START using flexbox */

  .gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }
  
  .card {
    width: 32%;
    position: relative;
    margin-bottom: 20px;
    border-radius: 10px;
    overflow: hidden;
  }

  .card img {
    height: 100%;
    width: 100%;
    filter: grayscale(100%);
    box-shadow: 0 0 20px #333;
    object-fit: cover;
  }
  
  .card:hover {
    transform: scale(1.03);
    filter: drop-shadow(0 0 10px #333);
    transition: 0.3s;
  }
  
  .card:hover img {
    filter: grayscale(0%);
  }
  
  .card figcaption {
    position: absolute;
    bottom: 0;
    left: 0;
    padding: 25px;
    width: 100%;
    height: 20%;
    font-size: 16px;
    font-weight: 500;
    color: #fff;
    opacity: 0;
    border-radius: 0 0 10px 10px;
    /* use https://cssgradient.io/ to generate gradient */
    background: linear-gradient(0deg, rgba(0, 0, 0, 0.5) 0%, rgba(255, 255, 255, 0) 100%);
    transition: 0.3s;
  }
  
  .card:hover figcaption {
    opacity: 1;
    transform: scale(1.03);
  }