body {
    background: #f9f9f9;
    margin: 0;
}

.header-navigation{
    position: fixed;
    background: rgba(0, 0, 0, 0.5) 0% !important;
    color: #fff;
    display: block;
    width: 100%;
    text-align: center;
    z-index: 9;
}

.button-header{
    background: none;
    border: none;
    color: #fff;
    padding: 20px;
}

.button-header:hover{
    cursor: pointer;
    color: #61a1be;
}

.top-content-gallery {
    width: auto;
    display: block;
    overflow: hidden;
    padding-top: 150px;
    padding-bottom: 50px;
    text-shadow: 1px 1px 0px #FFF;
}

.top-content-gallery-title {
    display: block;
    overflow: hidden;
    text-align: center;
    width: 100%;
    font-size: 36px;
}

.top-content-gallery-description {
    display: block;
    overflow: hidden;
    width: 100%;
    padding-top: 20px;
    padding-bottom: 20px;
    color: #666;
    text-align: center;
}

.gallery {
    list-style: none;
    padding: 0;
    width: 100%;
    overflow: hidden;

    /* Prevent vertical gaps */
   line-height: 0;
   
   -webkit-column-count: 5;
   -webkit-column-gap:   0px;
   -moz-column-count:    5;
   -moz-column-gap:      0px;
   column-count:         5;
   column-gap:           0px;
}

.gallery:after {
    clear: both;
    content: ".";
    display: block;
    height: 0;
    visibility: hidden;
}

.gallery li{
    width: 100%;
}

.gallery img{
    width: 100%;
    margin: 5px;
}

@media (max-width: 1200px) {
    .gallery {
    -moz-column-count:    4;
    -webkit-column-count: 4;
    column-count:         4;
    }
  }
  @media (max-width: 1000px) {
    .gallery {
    -moz-column-count:    3;
    -webkit-column-count: 3;
    column-count:         3;
    }
  }
  @media (max-width: 800px) {
    .gallery {
    -moz-column-count:    2;
    -webkit-column-count: 2;
    column-count:         2;
    }
  }
  @media (max-width: 400px) {
    .gallery {
    -moz-column-count:    1;
    -webkit-column-count: 1;
    column-count:         1;
    }
  }
  
/*
.row {
    display: flex;
    flex-wrap: wrap;
    padding: 0 4px;
  }
  
  /* Create four equal columns that sits next to each other *
  .column {
    flex: 25%;
    padding: 0 4px;
  }
  
  .column img {
    margin-top: 8px;
    vertical-align: middle;
  }
  
  /* Responsive layout - makes a two column-layout instead of four columns *
  @media (max-width: 800px) {
    .column {
      flex: 50%;
    }
  }
  
  /* Responsive layout - makes the two columns stack on top of each other instead of next to each other *
  @media (max-width: 600px) {
    .column {
      flex: 100%;
      max-width: 100%;
    }
  } */