.grid-flex {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
}

.grid-column-l-6 {
    flex: 1;
    margin: 0;
}

.grid-flex .grid-column-l-6:first-child {
    margin-right: 12px;
}

.grid-flex .grid-column-l-6:last-child {
    margin-left: 12px;
}

@media only screen and (max-width: 800px) {
  .grid-column-l-6 {
    flex: 100%;
    margin: 0;
    }
    
    .grid-flex .grid-column-l-6:first-child {
        margin-right: 0;
    }
    
    .grid-flex .grid-column-l-6:last-child {
        margin-left: 0;
    }
}