body {
  background-color: #ffffff;
  font-family: "comic sans ms";
  font-size: 10px;
  padding: 10px;
  text-align: center;

  /* 居中所有内容 */
  max-width: 60%;
  margin: auto;
  /* ^ try changing these numbers or deleting them */
}
h2 {
  font-size: 40px;
}

/* 大盒子 */

.row {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  /* ^ 横向: flex-start / center / flex-end / space-between */
  align-items: center;
  /* ^ 纵向: flex-start / center / flex-end / stretch */
  gap: 10px;
  flex-wrap: wrap;
  /* ^ 挤满是否换行: wrap / nowrap */

  background-color: white;
  border: 4px solid #0400ff;
  border-radius: 20px;
  padding: 20px;
  margin-bottom: 30px;
}

/* 小盒子 */

.box {
  width: 15px;
  height: 15px;
  border-radius: 20px;
  background-color: #ff8fb100;
  border: 4px solid #aaff00;
  display: flex;
  justify-content: center;
  align-items: center;
  /* animation: slide-in 2s infinite; */
}

/* @keyframes slide-in {
  from {
    width: 100%;
  }

  to {
    width: 0%;
  }
} */