body {
  font-family: Arial;
  background: #0f172a;
  color: white;
  text-align: center;
}

.tabs button {
  margin: 10px;
  padding: 10px;
  background: #38bdf8;
  border: none;
  cursor: pointer;
}

.hidden {
  display: none;
}

.tab-content {
  margin-top: 20px;
}

.form {
  background: #1e293b;
  padding: 20px;
  width: 60%;
  margin: auto;
  border-radius: 10px;
}

select {
  margin: 10px;
  padding: 5px;
}

button {
  border-radius: 5px;
}

#scenario {
  background: #1e293b;
  padding: 20px;
  width: 60%;
  margin: auto;
  border-radius: 10px;
}

#options button {
  display: block;
  margin: 10px auto;
  padding: 10px;
}

#chart {
  margin-top: 20px;
  background: white;
}