body {
  margin: 0;
  background: #f1f5f9;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.panel {
  width: 320px;
  height: 180px;
  margin: 48px auto;
  padding: 18px;
  overflow: auto;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 16px;
  box-sizing: border-box;
}