body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 90vh;
  margin: 5px;
  flex-direction: column;
}

.container {
  text-align: center;
  max-width: 560px;
}

.flashcard {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  margin-top: 20px;
  margin-bottom: 20px;
}

.question,
.answer {
  font-size: 18px;
  margin: 10px 0;
  text-wrap: balance;
}

.answer {
  display: none;
  color: #007bff;
}

.btn {
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 10px 20px;
  cursor: pointer;
  margin: 5px;
  font-size: 15px;
}

.btn:hover {
  background-color: #0056b3;
}

.progress-container {
  width: 100%;
  background-color: #e0e0e0;
  border-radius: 5px;
  margin: 20px 0;
}

.progress-bar {
  width: 0;
  height: 20px;
  background-color: #007bff;
  border-radius: 5px;
}

.toggle-div {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 5px;
}

.toggle {
  cursor: pointer;
  display: inline-block;
}

.toggle-switch {
  display: inline-block;
  background: #ccc;
  border-radius: 16px;
  width: 58px;
  height: 32px;
  position: relative;
  vertical-align: middle;
  transition: background 0.25s;
}

.toggle-switch:before, .toggle-switch:after {
  content: "";
}

.toggle-switch:before {
  display: block;
  background: linear-gradient(to bottom, #fff 0%, #eee 100%);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  position: absolute;
  top: 4px;
  left: 4px;
  transition: left 0.25s;
}

.toggle:hover .toggle-switch:before {
  background: linear-gradient(to bottom, #fff 0%, #fff 100%);
}

.toggle-checkbox:checked + .toggle-switch {
  background: #007bff;
}

.toggle-checkbox:checked + .toggle-switch:before {
  left: 30px;
}

.toggle-checkbox {
  position: absolute;
  visibility: hidden;
}

.toggle-label {
  margin-right: 5px;
  position: relative;
}