span.logo {
    color: white;
}

* {
    box-sizing: border-box;
  }
  
  .photo-gallery {
    display: flex;
    width: 98%;
    flex-wrap: wrap;
    padding: 0 4px;
  }
  
  .photo-gallery figure {
    margin: 0;
  }

  .photo-column {
    flex: 25%;
    max-width: 25%;
    padding: 0 4px;
  }
  
  .photo-column img {
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
  }
  
  /* Responsive layout - makes a two column-layout instead of four columns */
  @media (max-width: 800px) {
    .photo-column {
      flex: 50%;
      max-width: 50%;
    }
  }
  
  /* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
  @media (max-width: 600px) {
    .photo-column {
      flex: 100%;
      max-width: 100%;
    }
  }
  
aside {
  background-color: aqua;
  padding: 10px;
  margin-top: 8px;
  margin-bottom: 8px;
}

aside span {
  text-decoration: none;
}

aside > div {
  display: inline;
}