.c-columns {
  width: 100%;
}

.c-columns>.col, .c-columns>.space {
  float: left;
  min-height: 1px;
}

@media screen and (max-width: 640px) {
  .c-columns>.col {
    width: 100% !important;
  }
  .c-columns>.space {
    display: none;
  }
}