@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@100..900&display=swap');

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Noto Sans JP", sans-serif;;
  color: #0550ae;
  background-color: #f6f8fa;
}

#container {
  padding: 20px 10px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  width: 100%;
}

.kanji-card {
  display: none;
}

.card-info {
  text-align: center;
}

.kana-content,
.kanji-content {
  font-size: 75px;
  text-align: center;
}

.btn-wrapper {
  text-align: center;
  margin-top: 50px;
}

.btn {
  font-size: 14px;
  border: none;
  color: white;
  background-color: #0550ae;
  padding: 5px 0px;
  width: 75px;
  cursor: pointer;
}