.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 500px;
  max-width: 80%;
  margin: 150px auto;
}

.tabs {
  display: flex;
  width: 100%;
  justify-content: center;
}

.tab-link {
  padding: 0.5rem 1rem;
  border: 1px solid black;
  background-color: #222;
  color: #ffffff;
  cursor: pointer;
  width: 100%;
  opacity: 0.7;
  font-size: 1.15rem;
}

.tab-link.active {
  font-weight: bold;
  opacity: 0.9;
}

.tab-content {
  border: 1px solid #ddd;
  border-radius: 0.5rem;
  overflow: hidden;
  width: 100%;
}

.tab {
  padding: 1rem;
  display: none;
}

.tab.active {
  display: block;
}

.tab:not(.active) {
  display: none;
}

form input,
form button {
  display: block;
  margin: 0.75rem auto;
  padding: 0.5rem 1rem;
}

form input {
  width: 50%;
}

.error-message {
  color: red;
  text-align: center;
  margin: 0.5rem;
}