.widget {
  max-width: 400px;
  margin: 50px auto;
  font-family: Arial, sans-serif;
}

.card-images {
  display: flex;
  gap: 5px;
  margin-bottom: 15px;
}

.card-img {
  width: 50px;
  height: 30px;
  opacity: 0.3;
  border: 1px solid #ccc;
  border-radius: 3px;
}

.card-img.active {
  opacity: 1;
}

.input-wrapper {
  position: relative;
  margin-bottom: 10px;
}

#card-input {
  width: 100%;
  padding: 10px 35px 10px 10px;
  font-size: 16px;
  box-sizing: border-box;
}

.clear-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: #999;
  line-height: 1;
  padding: 0;
}

.clear-btn:hover {
  color: #333;
}

#validate-btn {
  padding: 10px 20px;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

#validate-btn:hover {
  background: #218838;
}

#result {
  margin-top: 10px;
  font-weight: bold;
}