stylus/manage/tooltips.css

:root {
  --tooltip-bkgd: #555;
  --tooltip-border: #777;
  --tooltip-text: #fff;
  --tooltip-error: #d40000;
  --tooltip-warn: goldenrod;
}

[data-title] {
  position: relative;
  overflow: visible;
}

[data-title]:after {
  -webkit-font-smoothing: subpixel-antialiased;
  background: var(--tooltip-bkgd);
  border: 1px solid var(--tooltip-border);
  border-radius: 3px;
  color: var(--tooltip-text);
  content: attr(data-title);
  font-size: 12px;
  line-height: 1.5em;
  letter-spacing: normal;
  padding: .5em .75em;
  text-align: center;
  text-decoration: none;
  text-shadow: none;
  text-transform: none;
  white-space: pre;
  word-break: break-all;
  overflow-wrap: break-word;
  max-width: 50vw;
  z-index: 1000000;
}

.targets [data-title]:after {
  white-space: pre-wrap;
  min-width: 240px;
}

.entry-last-update[data-title]:after {
  text-align: left;
}

[data-title]:after,
[data-title]:before {
  display: none;
  pointer-events: none;
  position: absolute;
}

[data-title]:before {
  border: 6px solid transparent;
  color: var(--tooltip-bkgd);
  content: "";
  height: 0;
  width: 0;
  z-index: 1000001;
}

[data-title]:hover:after,
[data-title]:hover:before {
  display: inline-block;
  text-decoration: none;
}

[data-title].tt-s:after,
[data-title].tt-se:after,
[data-title].tt-sw:after {
  margin-top: 6px;
  right: 50%;
  top: 100%
}

[data-title].tt-s:before,
[data-title].tt-se:before,
[data-title].tt-sw:before {
  border-bottom-color: var(--tooltip-bkgd);
  bottom: -7px;
  margin-right: -6px;
  right: 50%;
  top: auto
}

[data-title].tt-se:after {
  left: 50%;
  margin-left: -16px;
  right: auto
}

[data-title].tt-sw:after {
  margin-right: -16px
}

[data-title].tt-n:after,
[data-title].tt-ne:after,
[data-title].tt-nw:after {
  bottom: 100%;
  margin-bottom: 6px;
  right: 50%
}

[data-title].tt-n:before,
[data-title].tt-ne:before,
[data-title].tt-nw:before {
  border-top-color: var(--tooltip-bkgd);
  bottom: auto;
  margin-right: -6px;
  right: 50%;
  top: -7px
}

[data-title].tt-ne:after {
  left: 50%;
  margin-left: -16px;
  right: auto
}

[data-title].tt-nw:after {
  margin-right: -16px
}

[data-title].tt-n:after,
[data-title].tt-s:after {
  transform: translateX(50%)
}

[data-title].tt-w:after {
  bottom: 50%;
  margin-right: 6px;
  right: 100%;
  transform: translateY(50%)
}

[data-title].tt-w:before {
  border-left-color: var(--tooltip-bkgd);
  bottom: 50%;
  left: -7px;
  margin-top: -6px;
  top: 50%
}

[data-title].tt-e:after {
  bottom: 50%;
  left: 100%;
  margin-left: 6px;
  transform: translateY(50%)
}

[data-title].tt-e:before {
  border-right-color: var(--tooltip-bkgd);
  bottom: 50%;
  margin-top: -6px;
  right: -7px;
  top: 50%
}

.can-update .updater-icons .update:before {
  border-right-color: var(--tooltip-warn);
}

.entry-actions .entry-delete:before,
.update-problem .check-update:before {
  border-right-color: var(--tooltip-error);
}

@media (max-width: 1100px) {
  /* Action icons flip to left side; switch tooltip direction */
  #main-actions [data-title].tt-w:after {
    bottom: 50%;
    left: 100%;
    right: auto;
    margin-left: 6px;
    margin-right: 0;
    transform: translateY(50%)
  }

  #main-actions [data-title].tt-w:before {
    border-left-color: transparent;
    border-right-color: var(--tooltip-bkgd);
    bottom: 50%;
    margin-top: -6px;
    left: auto;
    right: -7px;
    top: 50%
  }
}