border-image: linear-gradient(to bottom, #3acfd5 0%, #3a4ed5 100%);
border-image-slice: 1;
col:nth-child(2) {
background: linear-gradient(to bottom, #3acfd5 0%, #3a4ed5 100%) no-repeat top left / 2px 100%, linear-gradient(to bottom, #3acfd5 0%, #3a4ed5 100%) no-repeat top right / 2px 100%,
linear-gradient(to left, #3acfd5, #3acfd5) no-repeat top / 100% 2px;
}