CSS Browser hack

/* Firefox */
@-moz-document url-prefix() {
  body,
  html {
    margin: 0;
    padding: 0;
  }
}

/* Chrome, Safari */
@media screen and (-webkit-min-device-pixel-ratio: 0) {
  body,
  html {
    margin: 0;
    padding: 0;
  }
}

/* IE10+ */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
  body,
  html {
    margin: 0;
    padding: 0;
  }
}