.devsite-landing-demo-code {
  float: left;
  width: calc((100% - 20px)*2/3);
}
.devsite-landing-demo-code pre {
  margin-top:0;
}
.devsite-landing-demo-image {
  float: right;
  margin: 0 0 0 40px;
  width: calc((100% - 80px)*1/3);
  max-width:424px;
}

@media screen and (max-width: 720px) {

  .devsite-landing-demo-code,
  .devsite-landing-demo-image {
    float: none;
    margin: 0 0 32px;
    width: 100%;
  }
}