img.img {
    max-width: 100%;
    width: 100%;
    display: block;
    -o-object-fit: cover;
       object-fit: cover;
    -o-object-position: center center;
       object-position: center center;
  }

.ul {
    margin-left: auto;
    margin-right: auto;
    width: 80%;
    background: lightgrey;
    padding: 1em;
    display: -ms-grid;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15em, 1fr));
    gap: 1em;
    color: var(--negro);
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    border-radius: 1em;
    background-color: var(--blanco);
    -webkit-box-shadow: 1em 1em 2em var(--sombra-ppal), -1em -1em 2em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
            box-shadow: 1em 1em 2em var(--sombra-ppal), -1em -1em 2em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
  }
  
  .ul .li {
    background: orange;
    overflow: hidden;
    color: var(--negro);
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    border-radius: 1em;
    background-color: var(--blanco);
    -webkit-box-shadow: 0.8em 0.8em 1.6em var(--sombra-ppal), -0.8em -0.8em 1.6em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
            box-shadow: 0.8em 0.8em 1.6em var(--sombra-ppal), -0.8em -0.8em 1.6em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
  }
  
  .ul .img {
    min-height: 25vh;
    -webkit-transition: all 0.5s ease;
    transition: all 0.5s ease;
    -webkit-transform: scale(1.4);
            transform: scale(1.4);
  }
  
  .ul .li:hover .img {
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  
  .lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    z-index: 2;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-flow: column nowrap;
            flex-flow: column nowrap;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    opacity: 0;
    -webkit-transform: scale(1.1);
            transform: scale(1.1);
    -webkit-transition: all 0.5s ease;
    transition: all 0.5s ease;
    pointer-events: none;
  }
  
  .lightbox.activo {
    opacity: 1;
    -webkit-transform: scale(1);
            transform: scale(1);
    pointer-events: auto;
  }
  
  .lightbox .cerrar {
    width: 5em;
    height: 3em;
    background: orange;
    margin: 0 0 1em;
    color: var(--negro);
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    border-radius: 1em;
    background-color: var(--blanco);
    -webkit-box-shadow: 0.5em 0.5em 1em var(--sombra-ppal), -0.5em -0.5em 1em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
            box-shadow: 0.5em 0.5em 1em var(--sombra-ppal), -0.5em -0.5em 1em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
    cursor: pointer;
  }
  
  .lightbox .cerrar:hover {
    color: var(--negro);
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    border-radius: 1em;
    background-color: var(--blanco);
    -webkit-box-shadow: 0 0 0 transparent, 0 0 0 transparent, inset 0.5em 0.5em 1em var(--sombra-ppal), inset -0.5em -0.5em 1em var(--sombra-sec);
            box-shadow: 0 0 0 transparent, 0 0 0 transparent, inset 0.5em 0.5em 1em var(--sombra-ppal), inset -0.5em -0.5em 1em var(--sombra-sec);
  }
  
  .lightbox .grande {
 /*   width: 80%;*/
    height: 80vh;
    background: lightblue;
    color: var(--negro);
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    border-radius: 1em;
    background-color: var(--blanco);
    -webkit-box-shadow: 1em 1em 2em var(--sombra-ppal), -1em -1em 2em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
            box-shadow: 1em 1em 2em var(--sombra-ppal), -1em -1em 2em var(--sombra-sec), inset 0 0 0 transparent, inset 0 0 0 transparent;
  }

  #contenido {
 
        margin: 20px;
        padding-left: 200px;
        padding-right: 200px;
        padding-top: 60px;
        border: 1px solid black;
        border-radius: 5px;
        background-color: #f9f9f9;
    }