body {
  margin: 30px;
  font-family: "SF Pro SC","SF Pro Text","SF Pro Icons","PingFang SC","Helvetica Neue","Helvetica","Arial",sans-serif;
}

.mt50 {
  margin-top: 50px;
}

.mr30 {
  margin-right: 30px;
}

.ml30 {
  margin-left: 30px;
}