message: Fix sv-item control element
diff: .sv-item__control {
  appearance: none;
  -webkit-appearance: none;
  - border: 3px solid;
  + border: 0.21em solid;
  border-color: $main-black-color;
  - height: 1.71px;
  - margin: 0;
  + height: 1.71em;
  + margin: 0em;
  opacity: 0.5;
  position: relative;
  vertical-align: middle;
  - width: 24px;
  + width: 1.71em;
  }
  .sv-item__control:checked {
  opacity: 1;
  