stylus/options/options.css

html.opera {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

html.opera body {
  width: auto;
}

html.firefox .block {
  padding-left: 6px;
}

html.firefox #notes {
  padding-left: calc(6px + 2ex);
}

body {
  background: #fff;
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, sans-serif;
  font-size: 12px;
  width: 480px;
  min-width: 400px;
  max-width: 800px;
}

.firefox button {
  -moz-appearance: none;
  user-select: none;
  padding: 3px 7px;
  border: 1px solid hsl(0, 0%, 62%);
  font: 400 13px Arial;
  line-height: 13px;
  color: #000;
  background-color: hsl(0, 0%, 100%);
  background: url(../images/button.png)repeat-x;
  background-size: 100% 100%;
  transition: background-color .25s, border-color .25s;
}

.firefox button:hover {
  background-color: hsl(0, 0%, 95%);
  border-color: hsl(0, 0%, 52%);
}

.firefox.moz-appearance-bug button {
  padding: 2px 4px;
}

:-webkit-any(button,input[type="button"],input[type="submit"]) {
  -webkit-appearance: none;
  user-select: none;
  padding: 3px 7px;
  border: 1px solid hsl(0, 0%, 62%);
  border-radius: 0;
  font: 400 13.3333px Arial;
  color: hsl(0, 0%, 0%);
  background-color: hsl(0, 0%, 100%);
  background-image: url(../images/button.png);
  background-repeat: repeat-x;
  background-size: 100% 100%;
  transition: background-color .25s, border-color .25s;
  text-shadow: none;
  box-shadow: none;
  min-height: unset;
}

:enabled:hover:-webkit-any(select,input[type="checkbox"],input[type="radio"],:-webkit-any(button,input[type="button"],input[type="submit"])) {
  background-color: hsl(0, 0%, 95%);
  background-image: url(../images/button.png);
  background-repeat: repeat-x;
  text-shadow: none;
  box-shadow: none;
  border-color: hsl(0, 0%, 52%);
}

@media (min-width: 401px) {
  .firefox body {
    width: calc(100% - 6px); /* TODO: rework to avoid compensating padding of 'html.firefox .block'  */
  }
}

.firefox body {
  /* match the default FF theme */
  background-color: #f9f9fa;
}

.firefox .chromium-only {
  display: none;
}

.block {
  display: flex;
  align-items: center;
  margin: 1em 0;
  border-bottom: 1px dotted #ccc;
  padding: 0 16px .75em;
  position: relative;
}

.block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.collapsed, .collapsible h1 {
  cursor: pointer;
}

.collapsed .items {
  display: none;
}

h1 {
  width: 30%;
  margin: 0;
  font-size: 120%;
  font-weight: bold;
  padding-right: 8px;
  box-sizing: border-box;
  overflow-wrap: break-word;
}

.items {
  width: 70%;
}

label {
  display: flex;
  margin: .25ex 0;
  align-items: center;
}

label > :first-child {
  margin-right: 8px;
  flex-grow: 1;
}

label:not([disabled]) > :first-child {
  cursor: default;
}

label:not([disabled]):hover > :first-child {
  text-shadow: 0 0 0.01px rgba(0, 0, 0, .25);
  cursor: pointer;
}

button,
input[type=number],
input[type="color"],
select,
.onoffswitch {
  width: 60px;
  box-sizing: border-box;
  flex-shrink: 0;
}

a {
  text-decoration-skip: ink;
}

button {
  text-align: center;
}

input[type=number] {
  text-align: right;
}

input[type=number]:invalid {
  background-color: rgba(255, 0, 0, 0.1);
  color: darkred;
}

input[type="color"] {
  box-sizing: border-box;
  height: 2em;
}

.iconset {
  display: flex;
}

.iconset input {
  display: block;
}

#actions {
  justify-content: space-around;
  align-items: stretch;
  padding-right: 8px;
}

#actions button {
  width: auto;
  margin-right: 8px;
}

[data-cmd="check-updates"] button {
  position: relative;
}

.update-in-progress [data-cmd="check-updates"] {
  opacity: .5;
  pointer-events: none;
}

.update-in-progress #update-progress {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  background-color: currentColor;
  content: "";
  opacity: .35;
}

#updates-installed {
  position: absolute;
  font-size: 85%;
  margin-top: 1px;
}

#updates-installed::after {
  content: attr(data-value);
  margin-left: .5ex;
  font-weight: bold;
}

#updates-installed:not([data-value]),
#updates-installed[data-value=""] {
  display: none;
}

#advanced.collapsible.collapsed {
  height: 40px;
  padding: 0;
  margin: 0;
  justify-content: center;
}

html:not(.firefox):not(.opera) #options > .block:nth-last-of-type(3) {
  margin-bottom: 0;
}

#advanced.collapsible:not(.collapsed) .collapsible-resizer,
#advanced:not(.collapsible) .collapsible-resizer {
  padding-right: 8px;
  box-sizing: border-box;
  width: 30%;
}

#advanced.collapsible h1 {
  width: unset;
  padding: 0;
  color: #333;
  transition: color .5s;
  display: inline-flex;
  align-items: center;
}

#advanced:not(.collapsible) .collapsible-resizer h1 {
  width: unset;
  padding: 0;
  display: inline-flex;
}

#advanced.collapsible:not(.collapsed) h1:hover {
  color: #666;
}

#advanced.collapsible.collapsed h1 {
  padding: 0;
  color: #666;
}

#advanced.collapsible.collapsed:hover h1 {
  color: #333;
}

#advanced.collapsible .svg-icon {
  fill: #333;
  transition: fill .5s;
  height: 16px;
  width: 16px;
}

#advanced.collapsible.collapsed .svg-icon,
#advanced.collapsible:not(.collapsed) h1:hover .svg-icon {
  fill: #666;
}

#advanced.collapsible.collapsed:hover .svg-icon {
  fill: #333;
}

#advanced.collapsible h1 .svg-icon {
  margin-left: 2px;
}

#advanced.collapsible.collapsed .is-expanded,
#advanced:not(.collapsible) .svg-icon {
  display: none;
}

#advanced.collapsible:not(.collapsed) .is-collapsed {
  display: none;
}

#notes {
  background-color: #f4f4f4;
  padding: 1.5ex 16px 1ex calc(16px + 2ex);
  font-size: 90%;
  color: #777;
}

#notes ol {
  margin: 0;
  padding: 0;
}

#notes li:not(last-child) {
  margin-bottom: 1ex;
}

#notes a {
  color: inherit;
}

#notes a:hover {
  color: black;
}

#notes p {
  line-height: 1.25;
  margin-top: 1ex;
  margin-bottom: 1ex;
}

sup {
  vertical-align: baseline;
  position: relative;
  top: -0.4em;
}

@keyframes fadeinout {
  0%   { opacity: 0 }
  10%  { opacity: 1 }
  25%  { opacity: 1 }
  100% { opacity: 0 }
}