.col-6-sm {
  width: 46%;
}

.row::after {
	content: "";
	display: table;
	clear: both;
}

.hidden-sm {
  display: none;
}

@media only screen and (min-width: 33.75em) {  /* 540px */
  .container {
    width: 80%;
  }
}

@media only screen and (min-width: 45em) {  /* 720px */
  .col-6 {
    width: 46%;
  }
  .hidden-sm {
    display: block;
  }
}

@media only screen and (min-width: 60em) { /* 960px */
  .container {
    width: 75%;
    max-width: 60rem;
  }
}