index.css

@font-face {
    font-family: 'Pixellari';
    src: url('fonts/Pixellari.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

body {
    padding: 0;
    margin: 0;
    background: #242424;
    font-family: Pixellari;
    font-size: 16px;
    color: #CCC;
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    -webkit-subpixel-antialiasing: none;
}

a { 
    cursor: default;
}

*::-webkit-scrollbar-track
{
	background: transparent;
}

*::-webkit-scrollbar
{
	width: 10px;
	background-color: transparent;
}

*::-webkit-scrollbar-thumb
{
	background-color: #14151A;
}

div {
    cursor: default;
    user-select: none;
}

.titlebar {
    height: 32px;
    background: #2C2C2C;
    -webkit-app-region: drag;
    position: relative;
}

.titlebar .title {
    position: absolute;
    top: 0;
    left: 16px;
    line-height: 34px;
    font-size: 16px;
    width: calc(100vw - 42px * 3);
    color: rgba(255, 255, 255, 0.7);
}

.titlebar .title .emph {
    color: white;
}

.titlebar .windowbuttons {
    position: absolute;
    top: 0; right: 0;
    width: 126px;
    height: 32px;
    -webkit-app-region: no-drag;
}

.titlebar .windowbuttons .button {
    display: block;
    float: right;
    border: none;
    background: transparent;
    color: rgba(255,255,255,0.5);
    height: 32px;
    width: 42px;
    line-height: 36px;
    text-align: center;
}

.titlebar .windowbuttons .button i {
    font-size: 13px;
}

.titlebar .windowbuttons .button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.titlebar .windowbuttons .button.close-button:hover {
    background: rgba(255, 0, 0, 0.3);
}

.menubar {
    height: 25px;
    background: #555555;
    position: relative;
    padding: 0 10px;
}

.menubar a {
    color: #BBBBBB;
    text-decoration: none;
    line-height: 26px;
    height: 25px;
    display: inline-block;
    padding: 0 5px;
    cursor: default;
    -webkit-user-drag: none;
}

.menubar a:hover {
    background: rgba(0, 0, 0, 0.1);
}

.container {
    display: flex;
    flex-direction: row;
    flex-grow: 2;
}

.filelist {
    flex: 0 0 260px;
    position: relative;
    overflow: hidden;
    background: #393939;
    border-right: 2px solid #282828;
}

.filelist .toolbar {
    position: absolute;
    top: 0;
    right: 16px;
}

.filelist .title {
    height: 32px;
    line-height: 32px;
    font-size: 16px;
    padding: 0 16px;
    color: rgba(255,255,255,0.5);
    box-sizing: border-box;
    border-bottom: 2px solid #282828;
    border-top: 2px solid #282828;
    box-shadow: inset 0px 2px 0px 0px #4A4A4A;
}

.filelist ul {
    list-style: none;
    padding: 0;
    margin: 0;
    height: calc(100vh - 89px);
    overflow-x: hidden;
    overflow-y: scroll;
}

.filelist ul li {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 16px;
    line-height: 24px;
    padding: 0 6px;
}

.filelist ul li i {
    font-size: 16px;
    position: relative;
    vertical-align: middle;
    margin-right: 6px;
}

.filelist ul li:hover {
    background: rgba(255, 255, 255, 0.03);

}

.filelist ul li.selected {
    background: rgba(255, 255, 255, 0.1);
}

.toolbar {
    padding: 0 6px;
    height: 32px;
    display: flex;
    background: #393939;
    border-bottom: 2px solid #282828;
    box-sizing: border-box;
    border-top: 2px solid #282828;
    box-shadow: inset 0px 2px 0px 0px #4A4A4A;
}

.toolbar.right {
    margin-left: 0;
    position: absolute;
    top: 0; right: 0;
}

.toolbar .button {
    display: inline-block;
    margin-right: 4px;
    width: 28px;
    height: 28px;
    display: flex;
    flex: 0 0 32px;
    justify-content: center;
    align-items: center;
}

.toolbar .button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.toolbar .button:active {
    background: rgba(255, 255, 255, 0.05);
}

.toolbar .button:active i, .toolbar .button:active img {
    position: relative;
    top: 1px;
}

.toolbar .button i {
    font-size: 22px;
}

.toolbar .button img {
    width: 16px;
    height: 16px;
    image-rendering: pixelated;
    opacity: 0.8;
}

.toolbar .separator {
    display: inline-block;
    width: 10px;
    height: 10px;
}

.editor {
    display: flex;
    flex-direction: column;
    flex-grow: 2;
    position: relative;
}

.editor iframe {
    border: none;
    padding: 0;
    margin: 0;
    flex-grow: 2;
}