:root {
  --dark-grey: rgb(211, 211, 211);
  --light-grey: #999;
  --light-color: #494949;
}
* {
  margin: 0;
  padding: 0;
}
a {
  color: var(--dark-grey: rgb(250, 250, 250));
  font-size: 30px;
  text-align: center;
}
body {
  background-color: var(--light-color, #f9f9f9);
  font-family: "Lato", sans-serif;
}
h1 {
  color: var(--dark-grey, #555);
  font-size: 44px;
  text-align: center;
  margin-top: 30px;
}
h2 {
  color: var(--light-grey, #999);
  font-size: 30px;
  text-align: left;
  margin-top: 30px;
}
p {
  color: var(--light-grey, #999);
  font-size: 14px;
  text-align: center;
}
.container {
  width: 90%;
  max-width: 1400px;
  margin: auto;
  display:grid;
  grid-template-columns: repeat(auto-fill,minmax(calc(9vw + 9vh),1fr));
  grid-gap: 2vmin;
  grid-auto-flow: dense;
  padding: 80px 0;
}

.thumbnail:first-child {
  grid-row-start: span 3;
  grid-column-start: span 3;	
}
.thumbnail:nth-child(2n+3) {
  grid-row-start: span 3;
}
.thumbnail:nth-child(4n+5) {
  grid-column-start: span 2;
  grid-row-start: span 2;
}
.thumbnail:nth-child(6n+7) {
  grid-row-start: span 2;
}
.thumbnail:nth-child(8n+9) {
  grid-column-start: span 3;
  grid-row-start: span 3;
}

.thumbnail img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: filter .3s;
  filter: grayscale(100%) brightness(50%);
  border-radius: 2px;
  box-shadow: 0 0 5px rgba(0, 0, 0, .5);
}
.thumbnail img:hover{
  filter: grayscale(0%) brightness(100%);
  transition: filter .3s;
}
.lightbox {
  display: none;
  position: fixed;
  z-index: 999;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.7);
  box-shadow: 0 0 50vmin #000 inset;
  color: var(--light-color, #fff);
  text-decoration: none;
}
.lightbox figcaption {
  padding-top: 10px;	
}
.full {
  text-align: center;
}
.full img {
  max-width: 90vw;
  max-height: 85vh;
  margin-top: 4vh;
}

.lightbox:target {
  display: block;
}




@media(max-width:680px){
  h1 {
    font-size: 28px;
  }
  p {
    font-size: 10px;
  }
  .container{
    display: block;
    padding: 50px 0 0 0;
    width: 100%;
  }
  .thumbnail img {
    margin-bottom: 2px;
    filter: grayscale(0%) brightness(100%);
    box-shadow: none;
  }
}