/* シンプルな角丸のボックス */
.rounded-box {
  width: 200px;
  height: 100px;
  background-color: #f0f0f0;
  border-radius: 10px;
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;
}

/* 複雑な角丸のボックス */
.complex-rounded-box {
  width: 300px;
  height: 150px;
  background-color: #e0e0e0;
  border-radius: 20px 40px 60px 80px / 40px 60px 80px 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;
}