message: Switch: clean up css & fix iOS design
diff: .Switch__pseudo {
  position: relative;
  display: block;
  + box-sizing: border-box;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-tap-highlight-color: transparent;
  }
  .Switch__pseudo::before {
  position: absolute;
  content: '';
  + border-radius: 50%;
  + box-sizing: border-box;
  }
  .Switch__self:checked + .Switch__pseudo::before {
  /**
  * iOS
  */
  -
  .Switch--ios .Switch__pseudo {
  width: 51px;
  height: 31px;
  - border: 2px solid var(--switch_ios_off_border);
  - background: transparent;
  + border: 2px solid transparent;
  + background: var(--placeholder_icon_background);
  border-radius: 15px;
  - box-sizing: border-box;
  transition:
  background-color .2s ease,
  border-color .2s ease;
  }
  .Switch--ios .Switch__self:checked + .Switch__pseudo {
  - border-color: var(--accent);
  background: var(--accent);
  }
  left: 0;
  width: 27px;
  height: 27px;
  - border-radius: 13px;
  background: var(--white);
  box-shadow:
  0 3px 8px rgba(0, 0, 0, .15),
  .Switch--ios.Switch--sizeY-compact .Switch__pseudo::before {
  width: 23px;
  height: 23px;
  - border-radius: 11px;
  }
  .Switch--ios .Switch__self:checked + .Switch__pseudo::before {
  /**
  * Android & VKCOM
  */
  -
  .Switch--android,
  .Switch--vkcom {
  padding: 3px;
  /**
  * Android
  */
  -
  .Switch--android .Switch__pseudo {
  width: 34px;
  height: 14px;
  }
  .Switch--android .Switch__pseudo::after {
  - background: #c6c5c5;
  + background: #c6c5c5; /* todo: 1077 replace w/ a variable */
  border-radius: 7px;
  }
  left: -3px;
  width: 20px;
  height: 20px;
  - background: #f1f1f1;
  - border-radius: 10px;
  + background: #f1f1f1; /* todo: 1077 replace w/ a proper variable */
  box-shadow: 0 0 2px 0 rgba(0, 0, 0, .12), 0 2px 2px 0 rgba(0, 0, 0, .24);
  transition: transform .1s ease;
  }
  .Switch--android.Switch--sizeY-compact .Switch__pseudo::before {
  width: 18px;
  height: 18px;
  - border-radius: 9px;
  }
  .Switch--android .Switch__self:checked + .Switch__pseudo::before {
  /**
  * VKCOM
  */
  -
  .Switch--vkcom .Switch__pseudo {
  width: 28px;
  height: 10px;
  height: 16px;
  background: var(--background_light);
  border: 1px solid var(--icon_tertiary);
  - border-radius: 8px;
  - box-sizing: border-box;
  transition: transform .1s ease;
  z-index: 1;
  }
  