body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color:aqua
}
h1{
    background-color: rgb(186, 146, 224);
}

#game {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 5px;
  justify-content: center;
  margin: 20px auto;
}

.first {
  width: 100px;
  height: 100px;
  font-size: 2em;
  background-color: white;
  border: 2px solid #333;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

button {
  margin-top: 10px;
  padding: 10px 20px;
  font-size: 16px;
}

.videobox {
  display: flex;
  justify-content: center;  
  align-items: center;      
  margin-top: 20px;
}

.videobox video{
    display: block;
}


.first:hover{
    background-color:rgb(196, 196, 31);
    
}

.br-0{
    border-right: 0;
}
.bl-0{
    border-left: 0;
}
.bt-0{
    border-top: 0;
}
.bb-0{
    border-bottom: 0;
}