body {
    margin: 0px;
    background-color: pink;
}

.image-grid img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.image-grid {
    padding: 50px;
}

@keyframes rainbow-text {
  0%   { color: red; }
  16%  { color: orange; }
  33%  { color: yellow; }
  50%  { color: green; }
  66%  { color: blue; }
  83%  { color: indigo; }
  100% { color: violet; }
}

.rainbow {
  animation: rainbow-text 3s linear infinite;
}