@keyframes flash {
  0%, 100% {background-color: black}
  50% {background-color: #1f1F1F}
  }
  

@keyframes flottement {
  0% {transform: translate(-3px, 0px) rotate(-0.3deg);}
  50% {transform: translate(0px, 3px)rotate(0.3deg);}
  100% {transform: translate(-3px, 0px) rotate(-0.3deg)}
}

@keyframes balancement{
  /*0% {transform: translate(0px, 0px) rotate(1deg);}*/
  0%{transform: translateX(-1px)rotate(1deg);}
  50%{transform: translateX(0px)rotate(-1deg);}
  100%{transform: translateX(1px)rotate(1deg);}
  /*100%{transform: translate(0px, 0px)rotate(1deg);}*/
  }

body{
  animation: flash 3s infinite alternate /*va et vient*/,
    balancement 2.5s infinite ease-in-out alternate;
  }
  
p{
  margin-top: 300px;
   text-align: center;
   color: white;
   text-shadow: white 1px 0 5px;
  }