love/source/atom/ui-template/tooltips.less

.tooltip {
  .tooltip-inner {
    background-color: @accent-7;
    color: @background-1;
    line-height: 1;
    max-width: none;
    padding: .75em;
    white-space: nowrap;
  }

  .keystroke {
    background: @background-2;
    color: @foreground-1;
    margin: 0 -.3em 0 .25em;
    padding: .15em .4em;
  }
}