message: Button: clean up css
diff: outline: none;
  text-decoration: none;
  border: none;
  + min-height: 30px;
  margin: 0;
  padding: 1px 16px;
  user-select: none;
  + border-radius: 8px;
  }
  .Button__in {
  .Button__before:not(:last-child) {
  margin-left: -4px;
  + margin-right: 6px;
  +}
  +
  +.Button__after:not(:first-child) {
  + margin-left: 6px;
  +}
  +
  +.Button__content {
  + padding-top: 4px;
  + padding-bottom: 6px;
  +}
  +
  +.Button__content--caps {
  + padding-top: 7px;
  + padding-bottom: 7px;
  }
  .Button[disabled] {
  color: #fff;
  }
  -.Button--sz-s {
  - min-height: 30px;
  -}
  -
  -.Button--sz-s .Button__before:not(:last-child) {
  - margin-right: 6px;
  -}
  -
  -.Button--sz-s .Button__after:not(:first-child) {
  - margin-left: 6px;
  -}
  -
  -.Button--sz-s .Button__content {
  - padding-top: 4px;
  - padding-bottom: 6px;
  -}
  -
  -.Button--sz-s .Button__content--caps {
  - padding-top: 7px;
  - padding-bottom: 7px;
  -}
  -
  .Button--sz-m {
  min-height: 36px;
  }
  -.Button--sz-m .Button__before:not(:last-child) {
  - margin-right: 6px;
  -}
  -
  -.Button--sz-m .Button__after:not(:first-child) {
  - margin-left: 6px;
  -}
  -
  .Button--sz-m .Button__content {
  padding-top: 6px;
  padding-bottom: 6px;
  margin-left: 8px;
  }
  +.Button--sz-l .Button__content {
  + padding-top: 10px;
  + padding-bottom: 12px;
  +}
  +
  .Button--sz-l .Button__in {
  justify-content: center;
  }
  padding-bottom: 11px;
  }
  -/*
  - Android
  - */
  -.Button--android {
  - border-radius: 8px;
  -}
  -
  -.Button--android.Button--sz-l .Button__content {
  - padding-top: 10px;
  - padding-bottom: 12px;
  -}
  -
  /*
  VKCOM
  */
  /*
  sizeY = Compact
  */
  -/* small size */
  -.Button--sizeY-compact.Button--sz-s {
  +.Button--sizeY-compact {
  min-height: 26px;
  }
  -.Button--sizeY-compact.Button--sz-s .Button__content {
  +.Button--sizeY-compact .Button__content {
  padding-top: 3px;
  padding-bottom: 5px;
  }
  -.Button--sizeY-compact.Button--sz-s .Button__content--caps {
  +.Button--sizeY-compact .Button__content--caps {
  padding-top: 5px;
  padding-bottom: 5px;
  }
  