gecko-dev/browser/themes/linux/devtools/font-inspector.css

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding-bottom: 20px;
}

#all-fonts {
  padding: 0;
  margin: 0;
}

#showall {
  border-radius: 0;
  border: 1px solid black;
  margin: 3px;
  cursor: pointer;
  position: fixed;
  bottom: 0;
  right: 0;
}

.font {
  padding: 10px 10px;
}

.theme-dark .font {
  border-bottom: 1px solid #444;
}

.theme-light .font {
  border-bottom: 1px solid #DDD;
}

.font:last-of-type {
  border-bottom: 0;
}

.theme-light .font:nth-child(even) {
  background: #F4F4F4;
}

.font-preview {
  height: 60px;
  width: 100%;
  border: 0;
  display: block;
}

.font-info {
  display: block;
}

.font-name {
  display: inline;
}

.font-css-code {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 5px;
}

.theme-light .font-css-code,
.theme-light .font-url {
  border: 1px solid #CCC;
  background: white;
}

.theme-dark .font-css-code,
.theme-dark .font-url {
  border: 1px solid #333;
  background: black;
  color: white;
}