body{
    margin: 0;
}
#start-page{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
}
#GameDiv, #Cocos3dGameContainer, #GameCanvas {
    width: 100%;
    height: 100%;
}
.logo{
    width: 100%;
    height: 100%;
    background-image: url(./loading.jpg);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    transform: rotate(0deg);
}
@media screen and (orientation: portrait) {   
    /*竖屏 css*/
    .logo{
        transform: rotate(90deg);
    }  
}