ant-design/components/style/core/base.less

// Config global less under antd
[class^=~'@{ant-prefix}-'],
[class*=~' @{ant-prefix}-'] {
  // remove the clear button of a text input control in IE10+
  &::-ms-clear,
  input::-ms-clear,
  input::-ms-reveal {
    display: none;
  }

  &,
  *,
  *::before,
  *::after {
    box-sizing: border-box; // 1
  }
}