#wrapper {
  border-bottom: 10px solid $primary-colour;
}

#wrapper * {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

#content {
  // Opera requires display:block for max-width to work...
  display: block;
  margin: 0 auto;
  max-width: 1020px;
  padding: 0 0 1em 0;

  background-color: $white;

  section {
    clear: left;
    float: left;
    width: 100%;
    position: relative;
    margin-top: 0.5em;
    margin-bottom: 1em;
    padding-top: 1em;

    border-top: 1px solid $grey-2;

    .visualisation {
      // This fixes an issue on the page-per-thing page when both tabs and "more info" are present.
      // http://www.quirksmode.org/css/clearing.html#link3
      overflow: auto;
      width: 100%;
    }
  }

  @media (max-width: 640px) {
    padding: 0;
  }
}

.performance-hidden {
  display:none;
}

.performance-platform-outer {
  margin: 0 30px;

  padding: 25px 0 0;

  @media (max-width: 640px) {
    margin-left: 15px;
    margin-right: 15px;
    padding: 1em 0;
  }
}

#wrapper {
  border-bottom: 10px solid $primary-colour;
}

#wrapper * {
  @include box-sizing(border-box);
}

#content {
  // Opera requires display:block for max-width to work...
  display: block;
  margin: 0 auto;
  max-width: 1020px;
  padding: 0 0 1em 0;

  background-color: $white;

  section {
    clear: left;
    float: left;
    width: 100%;
    position: relative;
    margin-top: 0.5em;
    margin-bottom: 1em;
    padding-top: 1em;

    border-top: 1px solid $grey-2;

    .visualisation {
      // This fixes an issue on the page-per-thing page when both tabs and "more info" are present.
      // http://www.quirksmode.org/css/clearing.html#link3
      overflow: auto;
      width: 100%;
    }
  }

  @media (max-width: 640px) {
    padding: 0;
  }
}

.performance-hidden {
  display:none;
}

.performance-platform-outer {
  margin: 0 30px;

  padding: 25px 0 0;

  @media (max-width: 640px) {
    margin-left: 15px;
    margin-right: 15px;
    padding: 1em 0;
  }
}

Use box-sizing mixin from frontend toolkit
Use box-sizing mixin from frontend toolkit

The frontend toolkit provides this code, so we shouldn't
duplicate it here.
