My custom CSS of SuperBookmarkDesktop the Chrome extension

SuperBookmarkDesktop.css

:root {
  --checkbox-unchecked-dark              : url("data:image/png;base64,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");
  --checkbox-unchecked-insensitive-dark  : url("data:image/png;base64,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");
  --checkbox-unchecked-selected          : url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAeCAMAAAAM7l6QAAAAA3NCSVQICAjb4U/gAAAACXBIWXMAABuvAAAbrwFeGpEcAAAAGXRFWHRTb2Z0d2FyZQB3d3cuaW5rc2NhcGUub3Jnm+48GgAAAEhQTFRFAAAA////////////////////////////////////////////////////////////////////////////////////////////53h4sAAAABh0Uk5TAAMEBw4PEBEVFkpLTF1eYmRlbXh5enuAxn9ntwAAAHZJREFUKM/tk8ESQCAYBkt+lFBU3/u/KQYd/M1wNva6110hXlBRe4OqLJVNYCSrTjtj8dMNFzAf3mLoiKEH9LuVKWgqoEOUm67hqYhHvekGrqwdml9/Tz/k8BDTnmLB6xHmCjmwkH0OWSgT+QbRqPyJ5BPJN/OtrGcZHig6P24AAAAASUVORK5CYII=");
  --checkbox-checked-dark                : url("data:image/png;base64,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");
  --checkbox-checked-insensitive-dark    : url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAeCAMAAAAM7l6QAAAAA3NCSVQICAjb4U/gAAAACXBIWXMAABuvAAAbrwFeGpEcAAAAGXRFWHRTb2Z0d2FyZQB3d3cuaW5rc2NhcGUub3Jnm+48GgAAAYZQTFRFAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABwcHFxcXGxsbHx8fKSkpJycnJiYmKSkpMTExMDAwNjY2Ozs7MjIyNTU1OTk5Pz8/QUFBQUFBQ0NDUlJSV1dXU1NTWVlZW1tbZGRkWlpaXl5eZ2dnWFhYZ2dnV1dXWVlZW1tbXFxcXl5eYGBgYWFhY2NjZWVlZmZmVVVVV1dXWFhYWlpaXFxcXV1dX19fYWFhYmJiZGRkZmZmZ2dnaWlpXl5eXFxcXV1dXl5eU1NTUVFRUlJSVFRUV1dXbGxsU1NTU1NTdnZ2eHh4dHR0dnZ2d3d3d3d3eHh4REREQEBAVVVVjY2NTExMT09PkZGRUVFRkJCQZGRkZGRkZmZmZ2dnaGhobGxsbm5upqamnJyctbW1tra2ubm5paWluLi4wMDAtLS0sbGxuLi4ubm5urq6xMTExMTExcXFxMTExcXFx8fHyMjIyMjIycnJysrKy8vLzMzMzMzMQuHirAAAAIF0Uk5TAAEICQ0RExQWGxwdHyMkJSYsLzEyNDU4OTo9QUJDQ0VKS0xjZG5+iYyOkpKXl5iYmJiYmJiYmJiZmZmZmZmZmZmZmZmZm5ycnaChoaGhoaKjqKipqamqrLCzs7m8vLy9vcXLy8zMz8/U2+Dk5urq7e/w9PT19fb29/f8/P39/f7+dej0zgAAATZJREFUKM99k1tPwkAQhb/ZbqFcDUQDqIkB/v9P8kVNbLcSQWqxS1t8aEB6c5828+WcnT2TEUR3lVA/eZ6kiHgdcJwaTXP4SbTuMOnO6uLv/T72Ut1lOh3kddwf6CxxtaLTsw1PI9OjUVr0XdbUGWQaFDqj5TigcNsoCjQibVhAN5QXcwlfi6uGqvph1UO9XdQVvFh7oKTAquo8X3mQ7CibTx7djxdgtupD4vtSbu1+xsR95nY5AOv7UUUtIE95tB6CDYLoXDv/ezcYoZbWg6PxC3ptHqr8BuVBasz+r9EztgYZA1lgtpRw4WRDYUwWmO0lh1KoiVFWf22utaXUbJBIFEkbxppywk2hVgeats47BnWKozZ8BJ3LZtRMTwdy5+TG1g4b6Hv4yaFYol59iZIjHKz8v4K/p9BquNpk5KgAAAAASUVORK5CYII=");
  --checkbox-checked-selected            : url("data:image/png;base64,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");
  --combobox-arrow                       : url("data:image/png;base64,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");
}

html, body {
  background: #1a1a1a;
}
a:-webkit-any-link {
  color: #4d90fe;
}

/* windows */
.window {
  border-radius: 8px;
  box-shadow: 0px 4px 8px 2px rgba(0,0,0,.5);
  opacity: 1;
}

.window.active {
  box-shadow: 0px 8px 24px 8px rgba(0,0,0,.5);
}

.window .window-top-nav,
.window .window-middle,
.window .window-bottom {
  background: rgba(35, 35, 35, 0.97);
  color: #ddd;
}

.window .bookmarkLink .name {
  color: #ddd;
}

.window-top {
  background-image: linear-gradient(0deg, #444444 0%, #4a4a4a 100%);
  background-color: #373737;
}

.window-top-middle {
  background-image: linear-gradient(0deg, #313131 0%, #3e3e3e 60%, #444444 100%);
  background-color: #373737;
  color: #fff;
  font-weight: 600;
  text-align: center;
}

.window .window-top-nav {
  border-bottom: 1px dashed #444;
}

.window:not(.active) .window-top,
.window:not(.active) .window-top-middle {
  background-image: none;
}

.close {
  border-radius: 100%;
  flex: 0 0 14px;
  height: 14px;
  position: relative;
  background: hsla(0, 100%, 60%, 1);
  cursor: default;
}

.window:not(.active) .close,
.window:not(.active) .close::before,
.window:not(.active) .close::after {
  background: #656565;
}

.close::before,
.close::after {
  content: "";
  position: absolute;
  height: 2px;
  width: 58%;
  top: 50%;
  left: 3px;
  margin-top: -1px;
  background: hsla(0, 100%, 60%, 1);
  border-radius: 5px;
}

.close::before {
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.close::after {
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

.close:hover::before,
.close:hover::after {
  background: hsla(0, 100%, 20%, 1);
}

.window:not(.active) .close:hover::before,
.window:not(.active) .close:hover::after {
  background: hsla(0, 0%, 15%, 1);
}

/* modals */
.prompt,
.modal {
  border-radius: 8px;
  background: rgba(35, 35, 35, 0.97) !important;
  color: #ddd;
  box-shadow: 0px 8px 24px 8px rgba(0,0,0,.5);
  border: 1px solid #444;
}

.modal .icon {
  margin: 0px 0px 1em 0px !important;
  border: 1px solid #404040;
  border-radius: .5em;
  width: auto;
}

.modal .iconBtn {
  font-size: inherit !important;
}

.modal [data-id="folderUi"],
.modal [data-id="bookmarkUi"] {
  margin-left: 1em;
}

.textareaContainer textarea {
  margin: 12px 0;
  background: #000000 !important;
  color: #ddd;
  resize: none;
  border: none;
  outline: none;
}

/* buttons */
.btn {
  height: fit-content;
}
.buttons {
}
.close-btns {
  margin: 8px;
}


/* arrows */
.arrow {
  border-bottom: 1px solid #fff;
  border-right: 1px solid #fff;
}

/* context menus */
.contextMenu {
  border: 1px solid #404040;
  border-radius: 6px;
  padding: 8px 0;
  background: rgba(35, 35, 35, 0.97);
  color: #ddd;
  box-shadow: 0px 8px 16px 4px rgba(0,0,0,.5);
}
.contextMenuItem:hover {
  background: #0a5cb5;
  color: #ffffff;
}
.contextMenuSeperator {
  border-bottom: 1px solid #404040;
}

/* scrollbar */
::-webkit-scrollbar {
  width: 16px !important;
  height: 16px !important;
}

::-webkit-scrollbar-thumb {
  background: #5f6368 !important;
  background-clip: padding-box !important;
  border: 4px solid transparent !important;
  -webkit-border-radius: 8px !important;
  border-radius: 8px !important;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
  min-height: 50px !important;
  min-width: 50px !important;
}

::-webkit-scrollbar-track {
  background: none !important;
  border: none !important;
}

::-webkit-scrollbar-track:vertical:hover {
  border-left: 1px solid rgba(0,0,0,.1) !important;
  background: rgba(0,0,0,.05) !important;
}

::-webkit-scrollbar-track:horizontal:hover {
  border-top: 1px solid rgba(0,0,0,.1) !important;
  background: rgba(0,0,0,.05) !important;
}

/* input & button forms */

select {
  height: auto !important;
  vertical-align: bottom;
}

input:not([type="checkbox"]),
input[type="text"],
input[type="number"],
select {
  border-radius: 5px !important;
  font-weight: inherit;
  padding: 2px 6px !important;
  background: inherit;
  border: 1px solid rgba(128,128,128,.5);
  color: inherit;
}

option {
  background: #333;
}

option:selected {
  background: rgb(0, 102, 199);
  color: #fff;
}

input:not([type="checkbox"]):focus,
button:focus,
select:focus,
input[type="checkbox"]:focus,
input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border: 1px solid rgb(0, 102, 199) !important;
  box-shadow: 0 0 0 2px rgb(0, 102, 199, .5) !important;
}/**/

input[type=checkbox]:focus {
  border: none !important;
}

select,
button {
  min-height: 20px !important;
  min-width: 16px !important;
  transition: all 100ms cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
  border: 1px solid !important;
  border-radius: 5px !important;
  padding: 0 6px !important;
  color: #eaeaea !important;
  border-color: rgba(0, 0, 0, 0.15) !important;
  border-top-color: rgba(0, 0, 0, 0.15) !important;
  border-bottom-color: rgba(0, 0, 0, 0.15) !important;
  background-color: #656565 !important;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.1), 0 1px 1px 0 rgba(0, 0, 0, 0.03) !important;
  background-image: none !important;
  text-shadow: none;
}

select:hover,
button:hover {
  color: #f8f7f7 !important;
  border-color: rgba(0, 0, 0, 0.15) !important;
  border-top-color: rgba(0, 0, 0, 0.15) !important;
  border-bottom-color: rgba(0, 0, 0, 0.15) !important;
  background-color: #6d6d6d !important;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.12), 0 1px 1px 0 rgba(0, 0, 0, 0.03) !important;
}

select:active,
button:active,
button:checked {
  color: #ffffff !important;
  background-color: #315bef !important;
  border-color: rgba(0, 0, 0, 0.15) !important;
  border-top-color: rgba(0, 0, 0, 0.15) !important;
  border-bottom-color: rgba(0, 0, 0, 0.15) !important;
  background-image: linear-gradient(0deg, #3861ca 0%, #3d6be3 100%) !important;
  background-clip: padding-box !important;
  transition-duration: 200ms !important;
  outline: none !important;
}

button:checked:hover {
  background-image: linear-gradient(0deg, #365cca 0%, #3b65e3 100%) !important;
}

select:active,
select:focus,
button:active,
button:focus {
  color: #dedede !important;
  outline: none !important;
}

select:active:hover,
button:active:hover, button:checked {
  color: #ffffff !important;
}

/* custom checkbox start */
input[type="checkbox"] {
  -webkit-appearance: none !important;
  height: 1.2em !important;
  width: 1.2em !important;
  background-size: contain !important;
  margin: 0 0 -.15em 0 !important;
  padding: 0;
  display: inline-block;
}

input[type="checkbox"]:not(:checked) {
  background: var(--checkbox-unchecked-dark);
}
input[type="checkbox"]:checked {
  background: var(--checkbox-checked-dark);
}
/* custom checkbox end */

select,
select:focus,
select:active {
  -webkit-appearance: none;
  padding: 2px 16px 2px 4px !important;
  background-image: var(--combobox-arrow) !important;
  background-position: right;
  background-repeat: no-repeat;
  background-size: contain;
}

.pell-actionbar {
  padding: .2em .7em .7em;
  border-bottom: thin dashed #656565;
}

button.pell-button {
  line-height: 1;
  vertical-align: top;
  height: fit-content;
  margin-right: 0.25em;
  font-family: -webkit-pictograph;
  font-weight: 600;
  font-size: 1.05em;
  width: fit-content;
}

button.pell-button:last-child {
  margin-right: 0;
}

button.pell-button[title="Code"] {
  font-family: monospace;
  font-size: 1em;
  line-height: 1;
  font-variant-ligatures: none;
  font-weight: normal;
}

.window.widget {
  box-shadow: none;
}

.window.widget .title {
  margin: 10px 10px;
}

.window.widget .e-resize.top-resize, .window.widget .title-bar, .window.widget .w-resize.top-resize {
  border-bottom: 1px solid transparent;
}

.window.widget:hover .e-resize.top-resize, .window.widget:hover .title-bar, .window.widget:hover .w-resize.top-resize {
  border-bottom: 1px solid #000;
}

.window.widget iframe {
  border-radius: .5em;
}

.window-middle {
  padding-top: 8px;
}

.label  {
  margin: 0 0 4px;
}

.backgroundSelector {
  border: 1px dashed #444;
}

.backgroundProperties,
.backgroundSectionTitle {
  border-bottom: 1px dashed #444;
}

.desktopUiLeft {
  padding-right: 10px;
}

.colorBtn {
  border-radius: .5em;
}

.bookmark.selected {
  background: rgba(0, 135, 255, 0.75);
}

.bottomButtons {
  margin-top: 10px;
}

.pageSizeRatio a {
  color: #fff;
}

/* window resize area */
.window:not(.widget) .e-resize,
.window:not(.widget) .w-resize {
  flex: 0 0 2px;
}

.window:not(.widget) .e-resize.top-resize,
.window:not(.widget) .w-resize.top-resize {
  flex: 0 0 8px;
}

.window:not(.widget) .ne-resize,
.window:not(.widget) .sw-resize {
  flex: 0 0 4px;
  height: 4px;
}

.window:not(.widget) .nw-resize,
.window:not(.widget) .se-resize {
  flex: 0 0 4px;
  height: 4px;
}

.window:not(.widget) .n-resize,
.window:not(.widget) .s-resize {
  height: 4px;
}

.window:not(.widget) .window-bottom {
  flex: 0 0 4px;
}

/* reddit widget */
iframe[src="chrome-extension://mfpgdeedjdffbfoomliadmehaoailnjn/widgets/reddit/index.html"],
iframe[src="./widgets/reddit/index.html"] {
  background: #1a1a1a;
}