uBlock/platform/mv3/extension/css/popup.css

 /* External CSS values override */
.fa-icon.fa-icon-badged > .fa-icon-badge {
    bottom: auto;
    top: -20%;
    }

:root body,
:root.mobile body {
    --font-size: 14px;
    --popup-gap: var(--font-size);
    --popup-gap-thin: calc(0.5 * var(--popup-gap));
    --popup-gap-extra-thin: calc(0.25 * var(--popup-gap));
    --popup-main-min-width: 18em;
    --popup-firewall-min-width: 30em;
    --popup-rule-cell-width: 5em;
    font-size: var(--font-size);
    line-height: 20px;
    min-width: 100%;
    }
:root body.loading {
    opacity: 0;
    }
a {
    color: var(--ink-1);
        fill: var(--ink-1);
    text-decoration: none;
    }
:focus {
    outline: 0;
    }

#main {
    align-self: flex-start;
    display: flex;
    flex-direction: column;
    max-width: 340px;
    min-width: 100%;
    }
:root.portrait #main {
    align-self: inherit;
    }
hr {
    border: 0;
    border-top: 1px solid var(--hr-ink);
    margin: 0;
    padding: 0;
    }

#hostname {
    align-items: center;
    background-color: var(--popup-toolbar-surface);
    display: flex;
    justify-content: center;
    min-height: calc(var(--font-size) * 3);
    padding: 0 var(--popup-gap-extra-thin);
    text-align: center;
    word-break: break-all;
    }
#hostname > span {
    word-break: break-all;
    }
#hostname > span + span {
    font-weight: 600;
    }

#filteringModeText {
    color: var(--ink-3);
    margin: var(--default-gap-small);
    margin-top: 0;
    text-align: center;
    text-transform: lowercase;
    }
#filteringModeText > span {
    color: var(--accent-surface-1);
    }
#filteringModeText > span:nth-of-type(2) {
    display: none;
    }
#filteringModeText > span:nth-of-type(2):not(:empty) {
    display: inline;
    }
#filteringModeText > span:nth-of-type(2):not(:empty)::before {
    content: '\2002\2192\2002';
    }
[dir="rtl"] #filteringModeText > span:nth-of-type(2):not(:empty)::before {
    content: '\2002\2190\2002';
    }

.filteringModeSlider {
    align-self: center;
    margin: var(--popup-gap);
    width: calc(var(--popup-main-min-width) - 1em);
    }

.rulesetTools {
    background-color: transparent;
    border: 0;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    width: 25%;
    }
.rulesetTools [id] {
    background-color: var(--popup-ruleset-tool-surface);
    border-radius: 4px;
    cursor: pointer;
    fill: var(--popup-ruleset-tool-ink);
    flex-grow: 1;
    font-size: 2.2em;
    padding: 0;
    visibility: hidden;
    }
.rulesetTools [id]:not(:first-of-type) {
    margin-block-start: 1px;
    }
.rulesetTools [id] > svg {
    fill: var(--ink-4);
    }
body.needReload #refresh {
    visibility: visible;
    }

#rulesetStats {
    padding: 0 var(--popup-gap-thin);
    }
#rulesetStats .rulesetDetails h1 {
    font-size: 1em;
    font-weight: normal;
    margin: 0.5em 0 0.25em 0;
    }
#rulesetStats .rulesetDetails p {
    color: var(--ink-2);
    font-size: var(--font-size-smaller);
    margin: 0.25em 0 0.5em 0.5em;
    }

.itemRibbon {
    column-gap: var(--popup-gap);
    display: grid;
    grid-auto-columns: 1fr;
    grid-auto-flow: column;
    grid-template: auto / 1fr 1fr;
    margin: var(--popup-gap);
    }
.itemRibbon > span + span {
    text-align: end;
    }

.toolRibbon {
    align-items: center;
    background-color: var(--popup-toolbar-surface);
    display: grid;
    grid-auto-columns: 1fr;
    grid-auto-flow: column;
    grid-template: auto / repeat(5, 1fr);
    justify-items: center;
    white-space: normal;
    }
.toolRibbon .tool {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    font-size: 1.4em;
    min-width: 32px;
    padding: var(--popup-gap)
             var(--popup-gap-thin);
    unicode-bidi: embed;
    visibility: hidden;
    }
.toolRibbon .tool:hover {
    color: var(--ink-1);
        fill: var(--ink-1);
    }
.toolRibbon .tool.enabled {
    visibility: visible;
    }
.toolRibbon .tool .caption {
    font: 10px/12px sans-serif;
    margin-top: 6px;
    text-align: center;
    }
body.mobile.no-tooltips .toolRibbon .tool {
    font-size: 1.6em;
    }
.toolRibbon.genericTools {
    margin-bottom: 0;
    }

#moreOrLess {
    column-gap: 0;
    display: grid;
    grid-template: auto / 1fr 1fr;
    justify-items: stretch;
    margin: 1px 0 0 0;
    }
#moreOrLess > span {
    cursor: pointer;
    margin: 0;
    padding: var(--popup-gap-thin) var(--popup-gap);
    user-select: none;
    white-space: nowrap;
    }
#moreButton .fa-icon {
    transform: rotate(180deg);
    }
#lessButton {
    border-inline-start: 1px solid var(--surface-1);
    text-align: end;
    }
body[data-section="a b"] #moreButton {
    pointer-events: none;
    visibility: hidden;
    }
body[data-section=""] #lessButton {
    pointer-events: none;
    visibility: hidden;
    }
body:not([data-section~="a"]) [data-section="a"] {
    display: none;
    }
body:not([data-section~="b"]) [data-section="b"] {
    display: none;
    }

/* configurable UI elements */
:root:not(.mobile) .toolRibbon .caption,
:root.mobile body.no-tooltips .toolRibbon .caption,
:root.mobile body[data-ui~="-captions"] .toolRibbon .caption {
    display: none;
    }
:root.mobile .toolRibbon .caption,
:root:not(.mobile) body[data-ui~="+captions"] .toolRibbon .caption {
    display: inherit;
    }
:root:not(.mobile) .toolRibbon .tool,
:root.mobile body.no-tooltips .toolRibbon .tool,
:root.mobile body[data-ui~="-captions"] .toolRibbon .tool {
    padding: var(--popup-gap) var(--popup-gap-thin);
    }
:root.mobile #moreOrLess > span {
    padding: var(--popup-gap);
    }

/* horizontally-constrained viewport */
:root.portrait body {
    overflow-y: auto;
    width: 100%;
    }
:root.portrait #main {
    max-width: unset;
    }
/* mouse-driven devices */
:root.desktop {
    display: flex;
    }
:root.desktop body {
    --popup-gap: calc(var(--font-size) * 0.875);
    }
:root.desktop .rulesetTools [id]:hover {
    background-color: var(--popup-ruleset-tool-surface-hover);
    }
:root.desktop .rulesetTools [id]:hover > svg {
    fill: var(--ink-2);
    }
:root.desktop .tool:hover {
    background-color: var(--popup-toolbar-surface-hover);
    }
:root.desktop #moreOrLess > span:hover {
    background-color: var(--surface-2);
    /* background-color: var(--popup-toolbar-surface-hover); */
    }

#templates {
    display: none;
    }