/*公共*/
.vent-flex-row {
  display: flex;
  align-items: center;
}
.vent-flex-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.vent-flex-row-wrap {
  display: flex;
  flex-wrap: wrap;
}
.vent-row-center{
  display: flex;
  justify-content: center;
  align-items: center;
}
.vent-column-center {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.vent-margin-b-20{
  margin-bottom: 20px;
}
.vent-margin-t-20 {
  margin-top: 20px;
}