body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  text-align: center;
  background: #e0f7ff;
  padding: 20px 10px;
}
main {
  padding: 20px;
}
.add-tip {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  text-align: center;
  z-index: 9999;
  padding: 10px;
}
.add-tip img {
  max-width: 90%;
  height: auto;
}