body{
    background-color:#d2d2d2;
    margin:0;
    width:100%; 
    height:100%;
    position: relative;
}
#canvas{
    background-color: #000;
    display: block;
    margin: auto;
}
#logo{
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -40%);
}
@media screen and (max-width:400px){
    #logo{
        height: 200px;
        width: 200px;
    }
}