body {
  margin: 0;
  font-family: sans-serif;
  display: flex;
  justify-content: center;   /* horizontal centering */
  align-items: center;       /* vertical centering (optional) */
  height: 100vh;
}

.container {
  text-align: center;
}

.container img {
  max-width: 200px;
  width: 100%;
  height: auto;
}

.container h1 {
  margin-top: 20px;
  font-size: 2.5em;
}