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if you need to support older versions of Safari (< 5.1), Chrome (< 10), and Firefox (< 29) for Box-sizing

html {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
*, *:before, *:after {
  -webkit-box-sizing: inherit;
  -moz-box-sizing: inherit;
  box-sizing: inherit;
  }

Always put the standardized versions of CSS properties after vendor-prefixed versions.