body {
  background-color: #212530; /* light pastel blue */
}

.banner img {
  display: block;
  margin: 20px auto;   /* centers it */
  max-width: 800px;    /* controls max size */
  width: 100%;         /* makes it responsive */
  height: auto;        /* keeps proportions */
}

.search-box {
  width: 400px;
  padding: 15px; /* makes it taller */