#panels-dnd-main:after {
  clear: both;
  content: ".";
  display: block;
  height: 0;
  visibility: hidden;
}

.site-content__main {
  float: left;
  margin: 0;
  width: 66%;
}

.site-content__main > * {
  margin: 0 .5em 1em 0;
}

.site-content__sidebar {
  float: left;
  margin: 0;
  width: 33%;
}

.site-content__sidebar > * {
  margin: 0 .5em 1em .5em;
}