discourse/app/assets/stylesheets/common/base/user-tips.scss

.user-tip-container {
  min-width: 300px;
  padding: 0.5em;
  text-align: left;

  .user-tip-title {
    font-size: $font-up-2;
    font-weight: bold;
  }

  .user-tip-content {
    margin-top: 0.25em;
  }

  .user-tip-buttons {
    margin-top: 1em;
  }
}

.tippy-box[data-theme~="user-tips"][data-placement^="left"]
  > .tippy-svg-arrow
  > svg {
  left: 11px;
}

.tippy-box[data-theme~="user-tips"][data-placement^="top"]
  > .tippy-svg-arrow
  > svg {
  top: 11px;
}

.tippy-box[data-theme~="user-tips"][data-placement^="bottom"]
  > .tippy-svg-arrow
  > svg {
  top: -13px;
  left: -1px;
}

.tippy-box[data-theme~="user-tips"] > .tippy-svg-arrow:after,
.tippy-box[data-theme~="user-tips"] > .tippy-svg-arrow > svg {
  width: 18px;
  height: 18px;
}