@media (prefers-color-scheme: light) {
  body {
    background: #FFF;
 
   
  }
}
@media (prefers-color-scheme: dark) {
  body {
    background:black;
  
  }
}

@media screen and (max-width: 480px) {
  .size {
    width: 100px;
  }
}

.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%)
}

.logo_animation {
  animation: logo-pulse 3.0s infinite ease;
}

@keyframes logo-pulse {
  0% {
    opacity: 0.1
  }
  50% {  
    opacity: 1.0
  }
  100% {
    opacity: 0.1
  }
}