html {
  width: 100%;
  height: 100%;
}
body {
  background-color: #fff;
  margin: 0;
  width: 100%;
  height: 100%;
}
.drawing {
  margin: 0;
  text-align: center;
  width: 100%;
  height: 100%;
}
#lines {
  width: 100%;
  height: 100%;
}

line {
  /*stroke: #fff;*/
  /*stroke-width: 2;*/
  stroke-linecap: round;
}