#demo{
}

.mode{
  display:inline-block;
  border:1px solid #aaa;
  width:50%;
  text-align:center;
  font-size:12vmin;
  color:#000;
  text-decoration:none;
}
a,b,textare,table,h1,h2{
  box-sizing:border-box;
  overflow:hidden;
}

#demo a.btn{
  display:block;
  text-align:center;
  font-size:12vh;
  font-weight:bold;
  cursor:pointer;
  user-select:none;
  border:1px solid #aaa;
  background-color:#fefefe;
  border-radius:8px;
  margin:2px;
  line-height:1.1em;
  height:12vh;
}
b{
  display:block;
  text-align:center;
  height:20vh;
  font-size:18vh;
  font-weight:bold;
  line-height:1em;
}
textarea{
  width:99%;
}

ul{
  display:flex;
  margin:0 auto;
	flex-wrap: wrap;
  font-size:18px;
}

ul li{
  width:9%;
  margin:2px;
  padding:2px;
  font-size:2vw;
  text-align:center;
  border:1px solid #eee;
}


table{
  margin:0 auto;
  width:100%;
  border:8px solid #000;
}
td{
  height:20%;
  width:19%;
  font-size:6vw;
  font-weight:bold;
  border:4px solid #333;
  text-align:center;
  vertical-align: middle;
  overflow:hidden;
  cursor:pointer;
  position:relative;
  left:0;
  bottom:0;
}

td:hover{
  background-color:#eee;
}

td .timestamp{
  position:absolute;
  right:0;
  bottom:0;
  font-size:9px;
  opacity:0.2;
}

.checked{
  background-color:#faa;
}
.checked:hover{
  background-color:#a00;
}
.bingo{
  background-color:#ffa;
}
#demo img{
  display:block;
  width:50vmin;
  margin:4vmin auto;
}

.mode1 table{
  height:100vh;
}
.mode2 b{
  height:50vh;
  font-size:48vh;
}