$btn-background: #ececec;
$btn-color: #666666;
$gray: #777777;
.operator {
  display: flex;
  height: 50px;
  justify-content: space-between;
  align-items: center;
  color: $gray;
}
.btn {
  display: inline-block;
  background-color: $btn-background;
  width: 74px;
  height: 24px;
  border-radius: 2px;
  line-height: 24px;
  color: $btn-color;
  text-align: center;
}
.btn:last-child {
  margin-left: 12px;
}