body {
  background-color: #1D2025;
}

.main{
  width: 90vw;
  margin: 0 auto;
  text-align: center;
}

.main_item {
  font-size: 30px;
  font-weight: 600;
  color: white;
  animation: shadow 2s infinite alternate;
}

@keyframes shadow {
  from {
    text-shadow:  
    0 0 10px #29d736, 
    0 0 15px #024e0d, 
    0 0 20px #14bc21;
  }

  to {
    text-shadow:  
    0 0 20px #58d729, 
    0 0 30px #024e13, 
    0 0 40px #14bc1d;
  }
}