Bootstrap/docs/assets/less/zero-clipboard.less

.zero-clipboard {
  position: relative;
  display: none;
}
.btn-clipboard {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 10;
  display: block;
  padding: 5px 8px;
  font-size: 12px;
  color: #767676;
  cursor: pointer;
  background-color: #fff;
  border: 1px solid #e1e1e8;
  border-radius: 0 4px 0 4px;
}
.btn-clipboard-hover {
  color: #fff;
  background-color: #563d7c;
  border-color: #563d7c;
}

@media (min-width: @screen-sm-min) {
  .zero-clipboard {
    display: block;
  }
  .bs-example + .zero-clipboard .btn-clipboard {
    top: -16px;
    border-top-right-radius: 0;
  }
}