.layout--arcs-twocol {
  width: 100%;
}

/* Two columns */
.col-1-2 {
  width: calc(50% - 20px);
  float: left;
  margin-right: 20px;
}

.col-1-2.right {
  float: right;
  margin-right: 0;
}

@media (max-width: 900px) {
  .col-1-2 {
    width: 100%;
    float: none;
    margin-right: 0;
    margin-bottom: 20px;
  }
}