body {
    -ms-touch-action: none;
    overflow: hidden;
}

.xz {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: block;
    z-index: 1;
    width: 1px;
    height: 1px;
}

.xz > img {
    width: 250px;
    height: 200px;
    pointer-events: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 增加了手机端旋转图标媒体查询，让图标缩小 2023.03.24 */
@media screen and (max-width: 767px) {
    .xz > img {
        width: 150px;
        height: 120px;
    }
}

@media screen and (min-width: 868px) {
    #backbuffer {
        inset: 0;
        margin: auto;
        max-width: 100%;
        max-height: 100vh;
        object-fit: contain;
        height: auto;
    }
}

@media screen and (max-width: 867px) {
    #backbuffer {
        inset: 0;
        margin: auto;
        max-width: 100%;
        max-height: 100vh;
        object-fit: contain;
        height: auto;
    }
}

#luoshengzu {
    cursor: grab;
    margin: 0px auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 增加修改全屏按钮 2023.03.27 */
.icon-button {
    background-color: #3ebefb;
    border: none;
    cursor: pointer;
    padding: 0;
    margin: 0;
    outline: none;
}

#fullScreenBtn {
    position: absolute;
    top: 5px;
    right: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    margin: 0;
    outline: none;
}

#fullScreenBtn img {
    width: 32px;
    height: 32px;
}

#toggleRotation {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 9999;
}