.layout {
  display: flex;
  flex-wrap: wrap;
}
    
.layout > div[class*='col-'] {  
  display: flex;
  flex-direction: column;
}

@media screen and (min-width: 768px) {
  .equal2, .equal2 > div[class*='col-'] {  
      display: -webkit-box;
      display: -moz-box;
      display: -ms-flexbox;
      display: -webkit-flex;
      display: flex;
      flex:1 0 auto;
  }
}