gecko-dev/devtools/client/themes/fonts.css

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#sidebar-panel-fontinspector {
  margin: 0;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

#font-container {
  overflow: auto;
  flex: auto;
}

#all-fonts {
  padding: 0;
  margin: 0;
  list-style: none;
}

.font {
  border: 1px solid var(--theme-splitter-color);
  border-width: 0 1px 1px 0;
  display: grid;
  grid-template-columns: 14px auto 1fr;
  grid-template-rows: 50px;
  grid-column-gap: 10px;
  padding: 0 10px;
}

#font-container .theme-twisty {
  display: inline-block;
  cursor: pointer;
  place-self: center;
  vertical-align: text-top;
}

.font-preview-container {
  grid-column: 3 / -1;
  grid-row: 1;
  overflow: hidden;
  display: grid;
  place-items: center end;
  position: relative;
}

.font-preview {
  height: 50px;
  display: block;
}

.font-preview:hover {
  cursor: text;
  background-image: linear-gradient(to right,
    var(--grey-40) 3px, transparent 3px, transparent);
  background-size: 6px 1px;
  background-repeat: repeat-x;
  background-position-y: 45px;
}

.font-preview-input {
  position: absolute;
  top: 0;
  left: 0;
  width: calc(100% - 5px);
  height: calc(100% - 2px);
  background: transparent;
  color: transparent;
}

.font-preview-input::-moz-selection {
  background: transparent;
  color: transparent;
}

.font-name {
  margin: 0;
  font-size: 1em;
  white-space: nowrap;
  grid-column: 2;
  place-self: center start;
}

.font-details {
  grid-column: 2 / 4;
  padding-inline-end: 14px;
  width: 100%;
}

.font-css-code {
  direction: ltr;
  padding: 5px;
  margin: 0;
  border: 1px solid var(--theme-splitter-color);
  border-radius: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--theme-toolbar-color);
}

.font-css-code-expander::before {
  content: "\2026";
  display: inline-block;
  width: 12px;
  height: 8px;
  margin: 0 2px;
  line-height: 3px;
  color: var(--theme-body-color-inactive);
  border-radius: 3px;
  border-style: solid;
  border-width: 1px;
  text-align: center;
  vertical-align: middle;
}

.font-format-url {
  text-transform: capitalize;
  margin-block-start: 0;
}

.font-url {
  margin-inline-start: 1em;
  text-transform: uppercase;
  text-decoration: underline;
  color: var(--theme-highlight-blue);
  background: transparent;
  border: none;
  cursor: pointer;
}

.font-url::after {
  content: "";
  display: inline-block;
  height: 13px;
  width: 13px;
  margin: -.3rem .15rem 0 0.25rem;
  vertical-align: middle;
  background-image: url(chrome://devtools-shim/content/aboutdevtools/images/external-link.svg);
  background-repeat: no-repeat;
  background-size: 13px 13px;
  -moz-context-properties: fill;
  fill: var(--blue-60);
}


.font:not(.expanded) .font-css-name,
.font:not(.expanded) .font-css-code,
.font:not(.expanded) .font-format-url {
  display: none;
}