body {
  margin: 40px;
  padding: 0;
  background-color: black;
}
h1 { margin-top:100px; text-align:center; color:#fff;}

.container {
  max-width: 800px;
  margin: auto;
  border: white solid 5px;
  background-color: white;
}

.panel-main img, .thumbs img {
  width: 100%;
  height: auto;
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-gap: 5px;
}
 @keyframes 
fadeIn {  to {
 opacity: 1;
}
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.5s ease-in 1 forwards;
}