ul,
ol,
dl,
dd,
dt,
li,
div,
html,
body,
p,
form,
hr,
h1,
h2,
h3,
h4,
h5,
img,
button {
  margin: 0;
  padding: 0;
}

html,
body,
#game-area {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}