/*返回顶部*/
#scrollUp, #feedback, .qr_tool {
    background-image: url(../images/backgrounds.png);
}

.bottom_tools {
    position: fixed;
    z-index: 999;
    right: 20px;
    bottom: 40px;
}

.bottom_tools > * {
    font: 0/0 a;
    display: block;
    margin-top: 5px;
    color: transparent;
    border: 0;
    background-color: transparent;
    text-shadow: none
}

.qr_img {
    position: absolute;
    top: -279px;
    left: -273px;
    display: none;
    max-width: 260px;
}

#scrollUp {
    width: 45px;
    height: 45px;
    background-position: -54px -53px;
    display: none;
}

#scrollUp:hover {
    background-position: -100px -53px
}

#feedback {
    width: 45px;
    height: 45px;
    background-position: -102px 0
}

#feedback:hover {
    background-position: -146px -46px
}

.qr_tool {
    width: 45px;
    height: 45px;
    background-position: -148px 0;
    cursor: pointer;
}

.qr_tool:hover {
    width: 45px;
    height: 45px;
    background-position: -192px -46px;
}