body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  color: #fff;
  height: 100vh;
  background: linear-gradient(270deg, #1e3c72, #2a5298, #3b8d99, #6dd5ed);
  background-size: 800% 800%;
  animation: animateBg 15s ease infinite;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
}
@keyframes animateBg {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
form {
  background: rgba(0, 0, 0, 0.7);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
  animation: slideIn 1s ease;
  width: 300px;
  text-align: center;
}
@keyframes slideIn {
  from { transform: translateY(-50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
input, button {
  padding: 10px;
  margin: 10px 0;
  width: 90%;
  border-radius: 5px;
  border: none;
  font-size: 16px;
}
button {
  background-color: #00c6ff;
  color: white;
  cursor: pointer;
  transition: background 0.3s;
}
button:hover {
  background-color: #0072ff;
}
a {
  color: #00ffff;
  text-decoration: none;
}
.history-box {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  padding: 20px;
  border-radius: 10px;
  max-height: 300px;
  overflow-y: auto;
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
  animation: slideIn 1s ease;
}
ul#expenseList {
  list-style: none;
  padding: 0;
  margin: 0;
}
ul#expenseList li {
  margin: 10px 0;
  padding: 10px;
  background: rgba(255, 255, 255, 0.05);
  border-left: 5px solid #00c6ff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 15px;
  border-radius: 5px;
}
ul#expenseList button {
  background: transparent;
  border: none;
  color: #ff4d4d;
  font-size: 18px;
  cursor: pointer;
}
ul#expenseList button:hover {
  color: red;
}