body {
  margin: 0;
  padding: 0;
  background: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.banner-container {
  box-shadow: 0 4px 18px rgba(0,0,0,0.2);
  border-radius: 10px;
  overflow: hidden;
  display: inline-block;
}

.banner-container img {
  display: block;
  max-width: 100%;
  height: auto;
}