.container {
    display: grid;
    justify-content: center;
    align-items: center;
  }
  
.grid {
    width: 200px;
    height: 400px;
    display: flex;
    flex-wrap: wrap;
    background-color: yellow;
  }
  
.grid div {
    height: 20px;
    width: 20px;
  }
  
.tetromino {
    background-color: blue;
  }
  
  
.mini-grid {
    margin: auto;
    width: 80px;
    height: 80px;
    display: flex;
    flex-wrap: wrap;
    background-color: yellow;
    margin-bottom: 5px;
  }
  
.mini-grid div {
    height: 20px;
    width: 20px;
  }

.btn{
    display: flex;
}