styles.css

body{
  background: #333;
}

.container{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.mid-container{
  display: flex;
  gap: 5px;
}

#tetris {
  background-color: #444;
  position: relative;
  color: #fff;
}

#info {
  width: 110px;
  padding: 20px;
  background-color: #555;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

#next-shape-container {
  position: relative;
  background-color: transparent;
  border: 1px solid white;
  width: 110px;
  height: 110px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn {
  width: 110px;
  height: 30px;
  background-color: #333;
  color: white;
  border: none;
}
#start:hover{
  width: 110px;
  height: 30px;
  background-color: #444;
  color: white;
  border: none;
}

#restart{
  animation: restartBtnAnimation 1s linear infinite;
}

@keyframes restartBtnAnimation {
  from {
    border: none;
  }

  to {
    border: 2px solide orange;
  }
}