body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  background-color: #f0f0f0;
  padding: 20px;
}

.icon {
  width: 64px;
  height: 64px;
  vertical-align: middle;
}

.icon-small {
  width: 24px;
  height: 24px;
  vertical-align: middle;
  margin-right: 8px;
}

button {
  padding: 10px 20px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 20px;
}