.cert-bg{
  width: 720px;
  height: 1320px;
  margin: 15px auto;
  background: url("https://oss.wsdns.cn/20250127/cb1088c3b1354a118477a0b1a3cdac41.png") no-repeat;
  background-size: 100%;
}
.cert-content{
  width: 480px;
  height: 720px;
  font-size: 24px;
  padding-top: 450px;
}