html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
}

.banner {
  background: #ffe082; /* Bright yellow */
  color: #000;
  padding: 10px;
  text-align: center;
  font-weight: bold;
  flex: 0 0 auto;
}

.image-container {
  position: relative;
  flex: 1 1 auto;
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}