.cloud{
    position: absolute;
    display: block;
    background: url(../img/clouds.png) no-repeat;
    background-size: auto 100%;
    animation: cloud-act infinite;
    -webkit-animation: cloud-act infinite;
}
@keyframes cloud-act{
    50%{
        transform: translate(-40px,0);
    }
}
@-webkit-keyframes cloud-act{
    50%{
        -webkit-transform: translate(-40px,0);
    }
}


#scene .tips-dialog{
    position: absolute;
    width: 100%;
    height: 100%;
    display: -webkit-box;
    -webkit-box-pack:center;
    -webkit-box-align:center;
}
#scene .tips-dialog>dfn{
    position: relative;
    display: block;
    width: 454px;
    height: auto;
    border: 3px solid white;
    border-radius: 8px;
    background: -webkit-linear-gradient(top,rgb(59,209,184),rgb(14,176,152));
}
#scene .tips-dialog>dfn>cite{
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 24px 30px 10px 30px;
    font-style: normal;
    color: white;
    font-size: 32px;
    line-height: 36px;

}
#scene .tips-dialog>dfn>b{
    position: relative;
    display: block;
    margin: 12px auto;
    width: 420px;
    height: 88px;
    border: 3px solid white;
    border-radius: 8px;
    font-size: 36px;
    color: white;
    text-align: center;
    line-height: 88px;
    font-style:  normal;
    background: -webkit-linear-gradient(top,rgb(1,255,216),rgb(45,223,197));
}
#scene .tips-dialog>dfn>b:active{
    background: -webkit-linear-gradient(top,rgb(45,223,197),rgb(1,255,216));
}
#scene .tips-dialog-hide{
    transition: all 0.4s;
    -webkit-transition: all 0.4s;
    visibility: hidden;
    opacity: 0;
    transform: scale(1.1);
    -webkit-transform: scale(1.1);
}