vs-code-vertical-tabs/media/tabs.css

/* Vertical Tabs — the tab list */

:root {
    --row-gap: 2px;
    --border-width: 3px;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    color: var(--vscode-foreground);
    background: var(--vscode-sideBar-background, transparent);
    font-family: var(--vscode-font-family);
    font-size: var(--vscode-font-size);
}

#list {
    height: 100%;
    padding: 3px 0;
    overflow-x: hidden;
    overflow-y: auto;
    outline: none;
}

/* --- a row -------------------------------------------------------------- */

.tab {
    display: flex;
    align-items: center;
    gap: 5px;
    min-height: 24px;
    margin: 0 2px var(--row-gap);
    padding: 2px 4px 2px 5px;
    border-left: var(--border-width) solid var(--tab-color, transparent);
    border-radius: 0 3px 3px 0;
    cursor: pointer;
    user-select: none;
    /* the close button only takes space while it is visible */
    overflow: hidden;
}

.tab:hover {
    background: var(--vscode-list-hoverBackground);
}

.tab.active {
    color: var(--vscode-list-activeSelectionForeground);
    background: var(--vscode-list-activeSelectionBackground);
}

.tab.selected:not(.active) {
    background: var(--vscode-list-inactiveSelectionBackground);
}

#list:focus-visible .tab.selected {
    outline: 1px solid var(--vscode-focusBorder);
    outline-offset: -1px;
}

.tab.inert {
    cursor: default;
}

.tab.inert .name {
    font-style: italic;
    opacity: 0.75;
}

/* --- the file name ------------------------------------------------------ */

/* The name is the point of the row, so it shrinks last: the detail text has a huge
   shrink factor and gives up its width first. */
.name {
    display: flex;
    flex: 1 1 auto;
    min-width: 0;
    align-items: baseline;
    white-space: nowrap;
}

/* The stem shrinks and ellipsizes; the extension never does, so ".cs" stays
   readable on a long name in a narrow strip. */
.stem {
    overflow: hidden;
    text-overflow: ellipsis;
}

.ext {
    flex: 0 0 auto;
    opacity: 0.8;
}

.tab.preview .name {
    font-style: italic;
}

.detail {
    flex: 0 1000 auto;
    min-width: 0;
    max-width: 45%;
    overflow: hidden;
    color: var(--vscode-descriptionForeground);
    font-size: 0.9em;
    text-align: right;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* --- markers and buttons ------------------------------------------------ */

.marker {
    flex: 0 0 auto;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--vscode-icon-foreground);
    border-radius: 3px;
    opacity: 0.85;
}

.marker svg {
    width: 12px;
    height: 12px;
    fill: currentColor;
}

button.marker {
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0;
}

.tab:hover button.marker,
.tab.active button.marker,
button.marker.on,
button.marker:focus-visible {
    opacity: 1;
}

button.marker:hover {
    background: var(--vscode-toolbar-hoverBackground);
}

button.marker:focus-visible {
    outline: 1px solid var(--vscode-focusBorder);
    outline-offset: -1px;
}

/* The pin leans over while it is only an offer; once the tab is really pinned it
   stands upright, so the state reads apart from the hover affordance. */
button.pin svg {
    transition: transform 80ms ease-out;
}

button.pin.on svg {
    transform: rotate(-45deg);
}

/* An unsaved file shows a dot, which the close button replaces on hover. */
.dirty {
    flex: 0 0 auto;
    width: 16px;
    display: flex;
    justify-content: center;
}

.dirty::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

.tab:hover .dirty,
.tab.active .dirty {
    display: none;
}

.tab:not(.is-dirty) .dirty {
    display: none;
}

.tab:not(:hover):not(.active) button.close {
    display: none;
}

/* --- the pinned block --------------------------------------------------- */

.separator {
    height: 1px;
    margin: 4px 6px 5px;
    background: var(--vscode-sideBarSectionHeader-border, var(--vscode-panel-border));
    opacity: 0.6;
}

/* --- context menu ------------------------------------------------------- */

#menu {
    position: fixed;
    z-index: 20;
    min-width: 180px;
    padding: 4px;
    color: var(--vscode-menu-foreground, var(--vscode-foreground));
    background: var(--vscode-menu-background, var(--vscode-editorWidget-background));
    border: 1px solid var(--vscode-menu-border, var(--vscode-editorWidget-border));
    border-radius: 4px;
    box-shadow: 0 2px 8px var(--vscode-widget-shadow, rgba(0, 0, 0, 0.36));
}

#menu[hidden] {
    display: none;
}

#menu button {
    display: block;
    width: 100%;
    padding: 4px 8px;
    color: inherit;
    background: none;
    border: none;
    border-radius: 2px;
    font-family: inherit;
    font-size: inherit;
    text-align: left;
    white-space: nowrap;
    cursor: pointer;
}

#menu button:hover,
#menu button:focus-visible {
    color: var(--vscode-menu-selectionForeground, inherit);
    background: var(--vscode-menu-selectionBackground, var(--vscode-list-hoverBackground));
    outline: none;
}

#menu .menu-separator {
    height: 1px;
    margin: 4px 2px;
    background: var(--vscode-menu-separatorBackground, var(--vscode-panel-border));
}

/* --- empty state -------------------------------------------------------- */

#empty {
    padding: 10px 12px;
    color: var(--vscode-descriptionForeground);
}

#empty[hidden] {
    display: none;
}