body{
  margin:0;
  font-family: Arial;
  background:#111;
  color:white;
}

#container{
  display:flex;
  height:90vh;
}

#left{
  width:15%;
  background:#1a1a1a;
  padding:10px;
}

.size{
  background:#333;
  margin:10px 0;
  padding:10px;
  text-align:center;
  cursor:pointer;
  border-radius:6px;
}

.size.active{
  background:#00ffff;
  color:black;
  font-weight:bold;
}

#center{
  flex:1;
  background:#222;
  display:flex;
  justify-content:center;
  align-items:center;
}

#right{
  width:20%;
  background:#1a1a1a;
  padding:10px;
}

#grid{
  background:#000;
}

#bottom{
  height:10vh;
  background:#000;
  display:flex;
  justify-content:center;
  align-items:center;
}

#validate{
  padding:15px 40px;
  font-size:18px;
  cursor:pointer;
}
#three-container{
  width:100%;
  height:100%;
  background:#000;
}
#three-wrapper{
  position:relative;
  width:100%;
  height:100%;
}

#fullscreen-btn{
  position:absolute;
  top:8px;
  left:8px;
  z-index:10;
  background:rgba(0,0,0,0.7);
  color:white;
  border:1px solid #444;
  border-radius:6px;
  padding:6px 10px;
  cursor:pointer;
  font-size:16px;
}

#fullscreen-btn:hover{
  background:rgba(255,255,255,0.15);
}