message: Add box-sizing: border-box for sv-panel block
diff: .sv-panel {
  padding: 0.44em 0.87em 0 0.87em;
  + box-sizing: border-box;
  }
  .sv-panel__title {
  font-size: 1.25em;
  padding-top: 0.5em;
  padding-bottom: 0.5em;
  padding-left: 0.44em;
  + padding-right: 1em;
  }
  .sv-panel__title--expandable {
  }
  