body {
  background-color: #3bb2b8;
  background: linear-gradient(
    25deg,
    rgba(66, 230, 149, 1),
    rgba(66, 32, 149, 1)
  );
  background-repeat: no-repeat;
  height: 100vh;
  font-family: "Open Sans", sans-serif;
}
#main .container {
  max-width: 900px;
  margin: 40px auto; /* centrado horizontal */
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-sizing: border-box;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.4);
  text-align: center;
}


.text-center {
  text-align: center;
  margin-bottom: 1em;
}

.lightbox-gallery {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;      /* centra las fotos horizontalmente */
  align-items: center;          /* centra las filas verticalmente */
  margin: 0 auto;               /* centra el contenedor */
  max-width: 1000px;            /* ajustá según el tamaño que te guste */
  text-align: center;
}



.lightbox-gallery div > img {
  max-width: 100%;
  display: block;
}

.lightbox-gallery div {
  margin: 10px;
  flex-basis: 180px;
}

@media only screen and (max-width: 480px) {
  .lightbox-gallery {
    flex-direction: column;
    align-items: center;
  }

  .lightbox > div {
    margin-bottom: 10px;
  }
}

/*Lighbox CSS*/

.lightbox {
  display: none;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  padding-top: 30px;
  box-sizing: border-box;
}

.lightbox img {
  display: block;
  margin: auto;
}

.lightbox .caption {
  margin: 15px auto;
  width: 50%;
  text-align: center;
  font-size: 1em;
  line-height: 1.5;
  font-weight: 700;
  color: #eee;
}

.github-link {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.7);
}

.github-link:hover,
.github-link:active,
.github-link:visited {
  color: #fff;
  text-decoration: none;
}
/* Centrado total de la galería */
#main {
  min-height: 100vh; /* ocupa toda la altura visible */
  display: flex;
  justify-content: center; /* centra horizontalmente */
  align-items: center; /* centra verticalmente */
  flex-direction: column;
}
.lightbox-gallery {
  max-width: 900px;
  width: 100%;
}
#footer {
  margin-top: 40px;
}