* {
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
    font-size: 0;
}


html, body {
    position: absolute;
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: #223344;
}

header {
    margin: 2.5vh auto;
    width: 80%;
    height: 5%;
    background: #112233;
    color: #DDEEFF;
    line-height: 5vh;
}


#textBox {
    display: inline-block;
    margin: 0 0 0 1.25vh;
    width: calc(100% - 16.25vh);
    font-size: 2.5vh;
    white-space: nowrap;
    overflow: auto hidden;
}


@font-face {
    font-family: 'PictureView';
    src: url('../iconFont/iconfont.woff2');
}


.headerBtn {
    vertical-align: top;
    display: inline-block;
    width: 5vh;
    font-family: "PictureView";
    text-align: center;
    font-size: 2.5vh;
}


#mainImageBox {
    position: relative;
    margin: auto;
    width: 80%;
    height: 67.5%;
    background: #112233;
}


#imageBox {
    margin: 2.5vh auto;
    width: 80%;
    height: 10%;
    background: #112233;
    white-space: nowrap;
    overflow: auto hidden;
}


.imageBtn {
    position: relative;
    display: inline-block;
    margin: 0 0 0 1vh;
    width: 10vh;
    height: 100%;
    background: #001122;
}


.imageBtn:nth-child(1) {
    margin: 0;
}


img {
    position: absolute;
    display: inline-block;
    top: 50%;
    left: 50%;
    max-width: 100%;
    max-height: 100%;
    transform: translate(-50%, -50%);
}

#btnBox {
    margin: auto;
    width: 80%;
    height: 5%;
    background: #112233;
    white-space: nowrap;
    overflow: auto hidden;
}


.btn {
    display: inline-block;
    margin: 0 0 0 1vh;
    width: 5vh;
    height: 100%;
    background: #001122;
    color: #DDEEFF;
    text-align: center;
    font-size: 2.5vh;
    line-height: 5vh;
}


.btn:nth-child(1) {
    margin: 0;
}