@salesforce-ux/design-system/css/checkbox-button/base/index.css

Salesforce Lightning Design System

/*! Lightning Design System 2.12.0 */
@charset "UTF-8";
.slds-checkbox-button {
  width: 2rem;
  height: 2rem;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  border: 1px solid #dddbda;
  border-radius: 0.25rem;
  color: #005fb2;
  cursor: pointer;
}
.slds-checkbox-button_is-checked {
  background-color: #005fb2;
  border-color: transparent;
  color: white;
}
.slds-checkbox-button_is-disabled {
  background-color: white;
  border-color: #dddbda;
  color: #dddbda;
  cursor: default;
}
.slds-checkbox-button_is-disabled.slds-checkbox-button_is-checked {
  background-color: #e0e5ee;
  border-color: rgba(0, 0, 0, 0);
  color: white;
}
.slds-checkbox-button_is-focused {
  outline: 0;
  -webkit-box-shadow: 0 0 3px #0070d2;
  box-shadow: 0 0 3px #0070d2;
  border-color: #1589ee;
}