html,
body {
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #000000;
}

* {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

div{ 
 width:100%; 
 height:100vh; 
 position:relative; 
} 

#maincanvas {
    width: 100vw;
    position:absolute; 
    top:0;bottom:0;right:0;left:0; 
    margin:auto; 
}