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Edit File: quicklook.css

/* quicklook window */
.elfinder-quicklook {
    position: absolute;
    background: url("../img/quicklook-bg.png");
    overflow: hidden;
    -moz-border-radius: 7px;
    -webkit-border-radius: 7px;
    border-radius: 7px;
    padding: 32px 0 40px 0;
}

.elfinder-navdock .elfinder-quicklook {
    -moz-border-radius: 0;
    -webkit-border-radius: 0;
    border-radius: 0;
    font-size: 90%;
    overflow: auto;
}

.elfinder-quicklook.elfinder-touch {
    padding: 30px 0 40px 0;
}

.elfinder-quicklook .ui-resizable-se {
    width: 14px;
    height: 14px;
    right: 5px;
    bottom: 3px;
    background: url("../img/toolbar.png") 0 -496px no-repeat;
}

.elfinder-quicklook.elfinder-touch .ui-resizable-se {
    -moz-transform-origin: bottom right;
    -moz-transform: scale(1.5);
    zoom: 1.5;
}

/* quicklook fullscreen window */
.elfinder-quicklook.elfinder-quicklook-fullscreen {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: 0;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 0;
    -moz-border-radius: 0;
    -webkit-border-radius: 0;
    -webkit-background-clip: padding-box;
    padding: 0;
    background: #000;
    display: block;
}

/* hide titlebar in fullscreen mode */
.elfinder-quicklook-fullscreen .elfinder-quicklook-titlebar,
.elfinder-quicklook-fullscreen.elfinder-quicklook .ui-resizable-handle{ display: none; }

/* hide preview border in fullscreen mode */
.elfinder-quicklook-fullscreen .elfinder-quicklook-preview {
    border: 0 solid;
}

.elfinder-quicklook-cover {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    position: absolute;
}

.elfinder-quicklook-cover.elfinder-quicklook-coverbg {
    /* background need to catch mouse event over browser plugin (eg PDF preview) */
    background-color: #fff;
    opacity: 0.000001;
    filter: Alpha(Opacity=0.0001);
}

/* quicklook titlebar */
.elfinder-quicklook-titlebar {
    text-align: center;
    background: #777;
    position: absolute;
    left: 0;
    top: 0;
    width: calc(100% - 12px);
    height: 20px;
    -moz-border-radius-topleft: 7px;
    -webkit-border-top-left-radius: 7px;
    border-top-left-radius: 7px;
    -moz-border-radius-topright: 7px;
    -webkit-border-top-right-radius: 7px;
    border-top-right-radius: 7px;
    border: none;
    line-height: 1.2;
    padding: 6px;
}

.elfinder-navdock .elfinder-quicklook-titlebar {
    -moz-border-radius-topleft: 0;
    -webkit-border-top-left-radius: 0;
    border-top-left-radius: 0;
    -moz-border-radius-topright: 0;
    -webkit-border-top-right-radius: 0;
    border-top-right-radius: 0;
    cursor: default;
}

.elfinder-touch .elfinder-quicklook-titlebar {
    height: 30px;
}

/* window title */
.elfinder-quicklook-title {
    display: inline-block;
    white-space: nowrap;
    overflow: hidden;
}

.elfinder-touch .elfinder-quicklook-title {
    padding: 8px 0;
}

/* icon "close" in titlebar */
.elfinder-quicklook-titlebar-icon {
    position: absolute;
    left: 4px;
    top: 50%;
    margin-top: -8px;
    height: 16px;
    border: none;
}
.elfinder-touch .elfinder-quicklook-titlebar-icon {
    height: 22px;
}

.elfinder-quicklook-titlebar-icon .ui-icon {
    position: relative;
    margin: -9px 3px 0px 0px;
    cursor: pointer;
    border-radius: 10px;
    border: 1px solid;
    opacity: .7;
    filter: Alpha(Opacity=70);
}

.elfinder-quicklook-titlebar-icon .ui-icon.ui-icon-closethick {
    padding-left: 1px;
}

.elfinder-mobile .elfinder-quicklook-titlebar-icon .ui-icon {
    opacity: .6;
    filter: Alpha(Opacity=60);
}

.elfinder-touch .elfinder-quicklook-titlebar-icon .ui-icon {
    margin-top: -5px;
}

.elfinder-quicklook-titlebar-icon.elfinder-titlebar-button-right {
    left: auto;
    right: 4px;
    direction: rtl;
}

.elfinder-quicklook-titlebar-icon.elfinder-titlebar-button-right .ui-icon {
    margin: -9px 0px 0px 3px;
}

.elfinder-touch .elfinder-quicklook-titlebar .ui-icon {
    -moz-transform-origin: center center;
    -moz-transform: scale(1.2);
    zoom: 1.2;
}

.elfinder-touch .elfinder-quicklook-titlebar-icon .ui-icon {
    margin-right: 10px;
}

.elfinder-touch .elfinder-quicklook-titlebar-icon.elfinder-titlebar-button-right .ui-icon {
    margin-left: 10px;
}

/* main part of quicklook window */
.elfinder-quicklook-preview {
    overflow: hidden;
    position: relative;
    border: 0 solid;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    height: 100%;
}

.elfinder-navdock .elfinder-quicklook-preview {
    border-left: 0;
    border-right: 0;
}

.elfinder-quicklook-preview.elfinder-overflow-auto {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* wrapper for file info/icon */
.elfinder-quicklook-info-wrapper {
    display: table;
    position: absolute;
    width: 100%;
    height: 100%;
    height: calc(100% - 80px);
    left: 0;
    top: 20px;
}

.elfinder-navdock .elfinder-quicklook-info-wrapper {
    height: calc(100% - 20px);
}

/* file info */
.elfinder-quicklook-info {
    display: table-cell;
    vertical-align: middle;
}

.elfinder-ltr .elfinder-quicklook-info {
    padding: 0 12px 0 112px;
}

.elfinder-rtl .elfinder-quicklook-info {
    padding: 0 112px 0 12px;
}

.elfinder-ltr .elfinder-navdock .elfinder-quicklook-info {
    padding: 0 0 0 80px;
}

.elfinder-rtl .elfinder-navdock .elfinder-quicklook-info {
    padding: 0 80px 0 0;
}

/* file name in info */
.elfinder-quicklook-info .elfinder-quicklook-info-data:first-child {
    color: #fff;
    font-weight: bold;
    padding-bottom: .5em;
}

/* other data in info */
.elfinder-quicklook-info-data {
    clear: both;
    padding-bottom: .2em;
    color: #fff;
}

.elfinder-quicklook-info-progress {
    width: 0;
    height: 4px;
    border-radius: 2px;
}

/* file icon */
.elfinder-quicklook .elfinder-cwd-icon {
    position: absolute;
    left: 32px;
    top: 50%;
    margin-top: -20px;
}

.elfinder-navdock .elfinder-quicklook .elfinder-cwd-icon {
    left: 16px;
}

.elfinder-rtl .elfinder-quicklook .elfinder-cwd-icon {
    left: auto;
    right: 32px;
}

.elfinder-rtl .elfinder-navdock .elfinder-quicklook .elfinder-cwd-icon {
    right: 6px;
}

.elfinder-quicklook .elfinder-cwd-icon:before {
    top: -10px;
}

.elfinder-ltr .elfinder-quicklook .elfinder-cwd-icon:before {
    left: 0;
    top: 5px;
}

.elfinder-ltr .elfinder-navdock .elfinder-quicklook .elfinder-cwd-icon:before {
    left: -14px;
}

.elfinder-ltr .elfinder-quicklook .elfinder-cwd-icon:after {
    left: -42px;
}

.elfinder-ltr .elfinder-navdock .elfinder-quicklook .elfinder-cwd-icon:after {
    left: -12px;
}

.elfinder-rtl .elfinder-quicklook .elfinder-cwd-icon:before {
    left: auto;
    right: 40px;
}

.elfinder-rtl .elfinder-quicklook .elfinder-cwd-icon:after {
    left: auto;
    right: 42px;
}

/* image in preview */
.elfinder-quicklook-preview > img,
.elfinder-quicklook-preview > div > canvas {
    display: block;
    margin: auto;
}

/* navigation bar on quicklook window bottom */
.elfinder-quicklook-navbar {
    position: absolute;
    left: 50%;
    bottom: 4px;
    width: 140px;
    height: 32px;
    padding: 0px;
    margin-left: -70px;
    border: 1px solid transparent;
    border-radius: 19px;
    -moz-border-radius: 19px;
    -webkit-border-radius: 19px;
}

/* navigation bar in fullscreen mode */
.elfinder-quicklook-fullscreen .elfinder-quicklook-navbar {
    width: 188px;
    margin-left: -94px;
    padding: 5px;
    border: 1px solid #eee;
    background: #000;
    opacity: 0.4;
    filter: Alpha(Opacity=40);
}

/* show close icon in fullscreen mode */
.elfinder-quicklook-fullscreen .elfinder-quicklook-navbar-icon-close,
.elfinder-quicklook-fullscreen .elfinder-quicklook-navbar-separator {
    display: inline;
}

/* icons in navbar */
.elfinder-quicklook-navbar-icon {
    width: 32px;
    height: 32px;
    margin: 0 7px;
    float: left;
    background: url("../img/quicklook-icons.png") 0 0 no-repeat;

}

/* fullscreen icon */
.elfinder-quicklook-navbar-icon-fullscreen {
    background-position: 0 -64px;
}

/* exit fullscreen icon */
.elfinder-quicklook-navbar-icon-fullscreen-off {
    background-position: 0 -96px;
}

/* prev file icon */
.elfinder-quicklook-navbar-icon-prev {
    background-position: 0 0;
}

/* next file icon */
.elfinder-quicklook-navbar-icon-next {
    background-position: 0 -32px;
}

/* close icon */
.elfinder-quicklook-navbar-icon-close {
    background-position: 0 -128px;
    display: none;
}

/* icons separator */
.elfinder-quicklook-navbar-separator {
    width: 1px;
    height: 32px;
    float: left;
    border-left: 1px solid #fff;
    display: none;
}

/* text encoding selector */
.elfinder-quicklook-encoding {
    height: 40px;
}
.elfinder-quicklook-encoding > select {
    color: #fff;
    background: #000;
    border: 0;
    font-size: 12px;
    max-width: 100px;
    display: inline-block;
    position: relative;
    top: 6px;
    left: 5px;
}
.elfinder-navdock .elfinder-quicklook .elfinder-quicklook-encoding {
    display: none;
}

/* text files preview wrapper */
.elfinder-quicklook-preview-text-wrapper {
    width: 100%;
    height: 100%;
    background: #fff;
    color: #222;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* archive files preview wrapper */
.elfinder-quicklook-preview-archive-wrapper {
    width: 100%;
    height: 100%;
    background: #fff;
    color: #222;
    font-size: 90%;
    overflow: auto;
    -webkit-overflow-scrolling: touch
}

/* archive files preview header */
.elfinder-quicklook-preview-archive-wrapper strong {
    padding: 0 5px;
}

/* text preview */
pre.elfinder-quicklook-preview-text,
pre.elfinder-quicklook-preview-text.prettyprint {
    width: auto;
    height: auto;
    margin: 0;
    padding: 3px 9px;
    border: none;
    overflow: visible;
    background: #fff;
    -o-tab-size: 4;
    -moz-tab-size: 4;
    tab-size: 4;
}

.elfinder-quicklook-preview-charsleft hr {
    border: none;
    border-top: dashed 1px;
}

.elfinder-quicklook-preview-charsleft span {
    font-size: 90%;
    font-style: italic;
    cursor: pointer;
}

/* html/pdf preview */
.elfinder-quicklook-preview-html,
.elfinder-quicklook-preview-pdf,
.elfinder-quicklook-preview-iframe {
    width: 100%;
    height: 100%;
    background: #fff;
    margin: 0;
    border: none;
    display: block;
}

/* swf preview container */
.elfinder-quicklook-preview-flash {
    width: 100%;
    height: 100%;
}

/* audio preview container */
.elfinder-quicklook-preview-audio {
    width: 100%;
    position: absolute;
    bottom: 0;
    left: 0;
}

/* audio preview using embed */
embed.elfinder-quicklook-preview-audio {
    height: 30px;
    background: transparent;
}

/* video preview container */
.elfinder-quicklook-preview-video {
    width: 100%;
    height: 100%;
}

/* video.js error message */
.elfinder-quicklook-preview .vjs-error .vjs-error-display .vjs-modal-dialog-content {
    font-size: 12pt;
    padding: 0;
    color: #fff;
}

/* allow user select */
.elfinder .elfinder-quicklook .elfinder-quicklook-info *,
.elfinder .elfinder-quicklook .elfinder-quicklook-preview * {
    -webkit-user-select: auto;
    -moz-user-select: text;
    -khtml-user-select: text;
    user-select: text;
}