style.css

html {
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.5);
}

body {
    background: #f5f5f5;
    color: #222;
    font-family: "Open Sans", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
    font-size: 13px;
    line-height: 18px;
    margin: 0px;
    text-align: left;
}

#copyarea {
    position: absolute;
    left: -100px;
    top: -100px;
}

.navigation {
    height: 30px;
    width: 180px;
    -webkit-app-region: drag;
    position: absolute;
    right: 0;
    background-color: rgba(0,0,0,0.5);
}
.gonav {
    height: 30px;
    width: 90px;
    -webkit-app-region: drag;
    position: absolute;
    left: 0;
    background-color: rgba(0,0,0,0.5);
}

.gonav input {
    width: 105px;
    background-color: #d0cece;
    border: none;
    padding: 3px;
    color: #cc181e;
}

.address {
    background-color: rgba(0,0,0,0.5);
    padding: 5px 3px;
    margin-top :30px;
    width: 163px;
}

.address span{
    background: #cc181e;
    padding: 2px 5px;
    color: white;
    opacity: 0.8;
}
.address span:hover{
    cursor: pointer;
    opacity: 1;
}

.none {
    display: none!important;
}


.close {
    background: url('img/x.png') center no-repeat;
}
.view {
    background: url('img/view.png') center no-repeat;
}
.search {
    background: url('img/search.png') center no-repeat;
}
.minimize {
    background: url('img/minimize.png') center no-repeat;
}
.copy {
    background: url('img/link.png') center no-repeat;
}
.back {
    background: url('img/back.png') center no-repeat;
}
.forward {
    background: url('img/forward.png') center no-repeat;
}
.youtube {
    background: url('img/youtube.png') center no-repeat;
}
.top {
    background-image: url('img/top.png');
    background-position: center;
    background-repeat: no-repeat;
}
.navactive {
    background-color: #7c7cbf;
}

.close, .view, .search, .top, .minimize,
.back, .forward, .youtube, .copy {
    -webkit-app-region: no-drag;
    background-size: 20px 20px;
    height: 20px;
    width: 20px;
    margin: 5px;
    float: right;
    opacity: 0.7;
    z-index: 50;
}

.back, .forward, .youtube {
    float: left;
}

.close:hover, .view:hover, .search:hover, .top:hover, .copy:hover,
.minimize:hover, .back:hover, .forward:hover, .youtube:hover {
    opacity: 1;
    cursor: pointer;
}