body {
padding:0;
margin:0;
overflow:hidden;
height: 600px;
}
canvas {
padding:0;
margin:0;
}
.btnbg > div{
color: #fff;
left: 50%;
transform: translateX(-50%);
top: 50%;
position: absolute;
text-align: center;
}
span{
font-size: 70px;
}
p{
font-size: 40px;
}
