body {
  background-color: #010101
}

/* Container behind your GIF */
.infinite-strip {
  display: flex;
  justify-content: center;
  align-items: center;

  /* Use your one image as a repeating horizontal background */
  background-image: url("https://cdn.imgchest.com/files/441d78c472ff.jpeg");
  background-repeat: repeat-x;
  background-position: center center;
  background-size: auto 100%; /* scale height to match strip */
  
  width: 100%;
  height: auto; /* will stretch based on the GIF height */
  padding: 0; 
}

.header {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
  z-index: 2;
}

.content {
  width: 600px;
  margin: 0 auto;
  background-color: #A76C9E;
  padding: 0 20px 20px 20px;
  border: 5px solid black;
  font-family: "Ultra", serif;
  font-size: 20px;
}