@salesforce-ux/design-system/css/checkbox/form-element/touch.css

Salesforce Lightning Design System

/*! Lightning Design System 2.12.0 */
@charset "UTF-8";
.slds-checkbox_standalone {
  min-height: 2.75rem;
}
.slds-checkbox_standalone [type="checkbox"] {
  width: 2.75rem;
  height: 2.75rem;
  position: absolute;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}
.slds-checkbox_standalone .slds-checkbox_faux {
  position: absolute;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}