.rd-col-33, .rd-col-50, .rd-col-66{ display:inline-block; vertical-align:top; }
.rd-col-33{ width:33.33%; }
.rd-col-50{ width:50%; }
.rd-col-66{ width:66.66%; }

@media screen and (max-width:800px){ 
    .rd-col-33, .rd-col-50, .rd-col-66{ width:100%; } }
@media screen and (min-width:801px){ 
    h1{ position:sticky; top:7rem; }
    .rd-col-33{ position:sticky; top:11rem; } }