.chunks {
  border: 1px solid black;
  border-radius: 15px;
  max-width: 1000px;
  margin: 0 auto;
  background: #d3d3d3;
  padding: 20px;
  margin: 20px 0 0 0;
  font-size: 16px;
}

.picbox {
 width: 100%; 
}