body {
  font-family: Arial, sans-serif;
  background: #f1f1f1;
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 500px;
  margin: 40px auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
  margin-bottom: 10px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 20px 0;
}

input {
  padding: 10px;
  font-size: 16px;
}

button {
  padding: 10px;
  background: #28a745;
  color: white;
  font-weight: bold;
  border: none;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background: #218838;
}

#transaction-list {
  list-style-type: none;
  padding: 0;
}

#transaction-list li {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  margin: 5px 0;
  border-left: 5px solid;
  background: #f9f9f9;
  border-radius: 5px;
}

.income {
  border-color: #28a745;
}

.expense {
  border-color: #dc3545;
}