Ghost/ghost/admin/app/styles/components/selectize.css

.selectize-control.plugin-drag_drop.multi > .selectize-input > div.ui-sortable-placeholder {
    visibility: visible !important;
    border: 0 none !important;
    background: #f2f2f2 !important;
    background: rgba(0, 0, 0, 0.06) !important;
}

.selectize-control.plugin-drag_drop .ui-sortable-placeholder:after {
    content: "!";
    visibility: hidden;
}

.selectize-control.plugin-drag_drop .ui-sortable-helper {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.selectize-dropdown-header {
    position: relative;
    padding: 5px 8px;
    border-bottom: 1px solid #d0d0d0;
    background: #f8f8f8;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.selectize-dropdown-header-close {
    position: absolute;
    top: 50%;
    right: 8px;
    margin-top: -12px;
    color: #303030;
    font-size: 20px !important;
    line-height: 20px;
    opacity: 0.4;
}

.selectize-dropdown-header-close:hover {
    color: #000;
}

.selectize-dropdown.plugin-optgroup_columns .optgroup {
    float: left;
    box-sizing: border-box;
    border-top: 0 none;
    border-right: 1px solid #f2f2f2;
}

.selectize-dropdown.plugin-optgroup_columns .optgroup:last-child {
    border-right: 0 none;
}

.selectize-dropdown.plugin-optgroup_columns .optgroup:before {
    display: none;
}

.selectize-dropdown.plugin-optgroup_columns .optgroup-header {
    border-top: 0 none;
}

.selectize-control.plugin-remove_button [data-value] {
    position: relative;
    padding-right: 20px !important;
}

.selectize-control.plugin-remove_button [data-value] .remove {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
    width: 17px;
    border-radius: 0 2px 2px 0;
    color: inherit;
    vertical-align: middle;
    text-align: center;
    text-decoration: none;
    font-size: 12px;
    font-weight: bold;
}

.selectize-control.plugin-remove_button [data-value] .remove:hover {
    background: rgba(0, 0, 0, 0.05);
}

.selectize-control.plugin-remove_button [data-value].active .remove {
    border-left-color: #00578d;
}

.selectize-control.plugin-remove_button .disabled [data-value] .remove:hover {
    background: none;
}

.selectize-control.plugin-remove_button .disabled [data-value] .remove {
    border-left-color: #aaa;
}

.selectize-control {
    position: relative;
}

.selectize-dropdown,
.selectize-input,
.selectize-input input {
    color: #303030;
    font-family: inherit;
    font-size: 1.4rem;
}

.selectize-input,
.selectize-control.single .selectize-input.input-active {
    display: inline-block;
    background: #fff;
    cursor: text;
}

.selectize-input {
    position: relative;
    z-index: 1;
    display: inline-block;
    overflow: hidden;
    box-sizing: border-box;
    padding: 8px 10px;
    width: 100%;
    height: 37px;
    border: 1px solid #dfe1e3;
    border-radius: var(--border-radius);
    color: #666;
    transition: border-color 0.15s linear;
}

.selectize-input.focus {
    border-color: #b1b1b1;
}

.selectize-control.multi .selectize-input.has-items {
    padding: 5px 8px 2px;
    height: auto;
}

.selectize-input.full {
    background-color: #fff;
}

.selectize-input.disabled,
.selectize-input.disabled * {
    cursor: default !important;
}

.selectize-input.dropdown-active {
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.selectize-input > * {
    display: -moz-inline-stack;
    display: inline-block;
    vertical-align: baseline;
    zoom: 1;

    *display: inline;
}

.selectize-control.multi .selectize-input > div {
    margin: 0 3px 3px 0;
    padding: 1px 4px;
    background: var(--blue);
    color: #fff;
    cursor: pointer;
}


/* Active tag - selected state when tag is clicked */
.selectize-control.multi .selectize-input > div.active {
    background: color(var(--blue) lightness(-10%));
    color: #fff;
}

.selectize-control.multi .selectize-input.disabled > div,
.selectize-control.multi .selectize-input.disabled > div.active {
    border: 1px solid #aaa;
    background: #d2d2d2;
    color: #fff;
}

.selectize-input > input {
    display: inline-block !important;
    margin: 0 1px !important;
    padding: 0 !important;
    min-height: 0 !important;
    max-width: 100% !important;
    max-height: none !important;
    border: 0 none !important;
    background: none !important;
    box-shadow: none !important;
    text-indent: 0 !important;
    line-height: inherit !important;
}

.selectize-input > input:-ms-clear {
    display: none;
}

.selectize-input > input:focus {
    outline: none !important;
}

.selectize-input:after {
    content: " ";
    display: block;
    clear: left;
}
.selectize-input.dropdown-active:before {
    content: " ";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    display: block;
    height: 1px;
    background: #f0f0f0;
}

.selectize-dropdown {
    position: absolute;
    z-index: 1000;
    box-sizing: border-box;
    margin: -1px 0 0 0;
    border: 1px solid #b1b1b1;
    border-top: 0 none;
    background: #fff;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

.selectize-dropdown [data-selectable] {
    overflow: hidden;
    cursor: pointer;
}

.selectize-dropdown [data-selectable] .highlight {
    background: #fff3b8;
    border-radius: 1px;
}

.selectize-dropdown [data-selectable],
.selectize-dropdown .optgroup-header,
.selectize-dropdown .dropdown-empty-message {
    padding: 7px 8px;
}

.selectize-dropdown .optgroup-header {
    background: #fff;
    color: #303030;
    cursor: default;
}

.selectize-dropdown .active {
    background: color(var(--blue) alpha(-85%));
    color: var(--darkgrey);
}

.selectize-dropdown .active.create {
    color: #666;
}

.selectize-dropdown .create {
    color: rgba(48, 48, 48, 0.5);
}

.selectize-dropdown-content {
    overflow-x: hidden;
    overflow-y: auto;
    max-height: 200px;
}

.selectize-control.single .selectize-input,
.selectize-control.single .selectize-input input {
    cursor: pointer;
}

.selectize-control.single .selectize-input.input-active,
.selectize-control.single .selectize-input.input-active input {
    cursor: text;
}

.selectize-control.single .selectize-input:after {
    content: " ";
    position: absolute;
    top: 50%;
    right: 15px;
    display: block;
    margin-top: -3px;
    width: 0;
    height: 0;
    border-width: 5px 5px 0 5px;
    border-style: solid;
    border-color: #808080 transparent transparent transparent;
}

.selectize-control.single .selectize-input.dropdown-active:after {
    margin-top: -4px;
    border-width: 0 5px 5px 5px;
    border-color: transparent transparent #808080 transparent;
}

.selectize-control.rtl.single .selectize-input:after {
    right: auto;
    left: 15px;
}

.selectize-control.rtl .selectize-input > input {
    margin: 0 4px 0 -2px !important;
}

.selectize-control .selectize-input.disabled {
    background-color: #fafafa;
    opacity: 0.5;
}

.selectize-control.multi .selectize-input.has-items {
    padding-right: 5px;
    padding-left: 5px;
}

.selectize-control.multi .selectize-input.disabled [data-value] {
    background: none;
    box-shadow: none;
    color: #999;
    text-shadow: none;
}

.selectize-control.multi .selectize-input.disabled [data-value],
.selectize-control.multi .selectize-input.disabled [data-value] .remove {
    border-color: #e6e6e6;
}

.selectize-control.multi .selectize-input.disabled [data-value] .remove {
    background: none;
}

.selectize-control.multi .selectize-input [data-value] {
    background: var(--blue);
    border-radius: 3px;
}

.selectize-control.multi .selectize-input [data-value].active {
    background: color(var(--blue) lightness(-10%));
}

.selectize-control.single .selectize-input {
    background: #f9f9f9;
}

.selectize-control.single .selectize-input,
.selectize-dropdown.single {
    border-color: #b8b8b8;
}

.optgroup:first-of-type .optgroup-header {
    margin-bottom: 7px;
    padding-top: 0;
    padding-bottom: 0;
}

.selectize-dropdown .optgroup-header {
    position: relative;
    display: inline-block;
    padding-top: 7px;
    background: #fff;
    color: var(--midgrey);
    font-size: 0.85em;
}

.selectize-dropdown .optgroup-header:after {
    content: "";
    position: absolute;
    top: 52%;
    left: calc(100% + 3px);
    display: block;
    width: calc(189px - 100%);
    height: 1px;
    border-bottom: #dfe1e3 1px solid;
}
@media (max-width: 800px) {
    .selectize-dropdown .optgroup-header:after {
        width: calc(224px - 100%);
    }
}
@media (max-width: 500px) {
    .selectize-dropdown .optgroup-header:after {
        width: calc(80vw - 45px - 100%);
    }
}

.selectize-dropdown .option {
    line-height: 1.35em;
}

.dropdown-empty-message {
    position: relative;
    color: var(--midgrey);
    font-size: 0.9em;
}