:root {
    --gutter: 0.75rem;
  }
  
  .image {
    width: 100%;
  }
  
  .grid {
    width: 100%;
    max-width: 60rem;
    margin: 1rem auto;
    display: grid;
    grid-gap: var(--gutter);
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    background: #e8e8e8;
  }
  
  .item {
    filter: drop-shadow(0px 0px 4px rgba(0, 0, 0, 0.5));
    will-change: filter;
  }
  
  .envelope {
    clip-path: polygon(5% 5%, 95% 5%, 95% 95%, 5% 95%);
    will-change: clip-path;
    pointer-events: none;
  }
  
  .item:hover {
    filter: drop-shadow(0px 0px 10px rgba(0, 0, 0, 0.6));
  }
  
  .item:hover .envelope {
    animation: 0.25s ease-out forwards grow;
  }
  
  .item.go-back .envelope {
    animation: 0.3s ease-in shrink;
  }
  
  @keyframes grow {
    0% {
      clip-path: polygon(5% 5%, 95% 5%, 95% 95%, 5% 95%);
    }
    50% {
      clip-path: polygon(0% 0%, 95% 5%, 100% 100%, 5% 95%);
    }
    100% {
      clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
    }
  }
  @keyframes shrink {
    0% {
      clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
    }
    50% {
      clip-path: polygon(0% 0%, 95% 5%, 100% 100%, 5% 95%);
    }
    100% {
      clip-path: polygon(5% 5%, 95% 5%, 95% 95%, 5% 95%);
    }
  }