.start_row{
    max-width: 1200px;
    margin: auto;
    margin-bottom: 30px;
    background: white;
    padding: 20px;
}

.start_row_1{
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 0.3s linear;
}
.start_row_2{
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 0.6s linear;
}
.start_row_3{
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 0.9s linear;
}
.start_row_4{
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 1.2s linear;
}
.start_row_switch {
  visibility: visible;
  opacity: 1;
}