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

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

:root {
    --popup-min-width: calc(
        var(--filtering-mode-slider-width) +
        var(--filtering-mode-button-size) / 2
    );
}

:root body,
:root.mobile body {
    --popup-gap: var(--font-size);
    --popup-gap-thin: calc(0.5 * var(--popup-gap));
    --popup-gap-extra-thin: calc(0.25 * var(--popup-gap));
    min-width: var(--popup-min-width);
}
:root body.loading {
    visibility: hidden;
}
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;
}
:root.portrait #main {
    align-self: inherit;
}
hr {
    margin: 0.5em 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;
}

body[data-forbid~="filteringMode"] .filteringModeSlider {
    pointer-events: none;
}
body[data-forbid~="zapper"] #gotoZapper,
body[data-forbid~="picker"] #gotoPicker,
body[data-forbid~="picker"] #gotoUnpicker,
body[data-forbid~="report"] #gotoReport,
body[data-forbid~="zapper"][data-forbid~="picker"][data-forbid~="report"] .localTools {
    display: none;
}
body[data-forbid~="dashboard"] .globalTools {
    display: none;
}

#filteringModeText {
    color: var(--ink-3);
    margin-bottom: var(--popup-gap-thin);
    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) 0;
}

body.needReload #refresh {
    visibility: visible;
}

.toolMenu {
    border-top: 1px solid var(--surface-2);
    display: flex;
    flex-direction: column;
    margin: 0.5em 0;
    padding-top: 0.5em;
}
:root:not(.isHTTP) .needHTTP {
    display: none;
}
.toolMenu > label {
    font-size: 90%;
    color: var(--ink-2);
    line-height: calc(var(--font-size) * 1.8);
    margin-inline-start: 0.5em;
}
.toolMenu > .tool {
    cursor: pointer;
    display: flex;
    padding: 0.5em 0.5em 0.5em 0;
    unicode-bidi: embed;
}
.toolMenu > .tool:hover {
    color: var(--ink-1);
      fill: var(--ink-1);
}
.toolMenu > .tool:not(.enabled) {
    display: none;
}
.toolMenu > .tool .fa-icon {
    font-size: 1.4em;
    min-width: 1.4em;
}
.toolMenu > .tool [data-i18n] {
    flex-grow: 1;
}

.toolRibbon {
    background-color: var(--popup-toolbar-surface);
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-between;
    margin: 0;
    white-space: normal;
}
.toolRibbon .tool {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    min-width: 32px;
    padding: var(--default-gap-small);
    unicode-bidi: embed;
    visibility: hidden;
}
.toolRibbon .tool:hover {
    color: var(--ink-1);
        fill: var(--ink-1);
}
.toolRibbon .tool.enabled {
    visibility: visible;
}
.toolRibbon .tool.fa-icon {
    font-size: 1.4em;
}
:root.mobile .toolRibbon .tool.fa-icon {
    font-size: 1.6em;
}
.toolRibbon .tool .caption {
    font: 10px/12px sans-serif;
    margin-top: 6px;
    text-align: center;
}
:root:not(.mobile) .toolRibbon .caption {
    display: none;
}

/* 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 .tool:hover {
    background-color: var(--popup-toolbar-surface-hover);
}