Header with background animate 01 

<!DOCTYPE html>
<html>
<head>
	<title>BACKGROUND OVERLAY | par NGLESSON</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta name="keyword" content="BACKGROUND OVERLAY">
	<meta name="author" content="Mezgani said">
	<meta name="copyright" content="NGLESSON">
	<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet">
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
	<link href="style.css" rel="stylesheet">
</head>
<body>

	<div class="menu" id="menu">
		<li><a href="#">ACCUEIL</a></li>
		<li><a href="#">ABOUT ME</a></li>
		<li><a href="#">MY WORKS</a></li>
		<li><a href="#">CONTACT ME</a></li>
	</div>
	<div class="container gradient-purple-blue">
	  <div class="under-container bubble" style="height:90vh;">
		<div class="line">
		  <div class="square" id="square">H</div>
		  <div class="square" >e</div>
		  <div class="square" >l</div>
		  <div class="square" >l</div>
		  <div class="square" >o</div>
		  <div class="square" style="margin-left:30px;">I</div>
		  <div class="square" >'</div>
		  <div class="square" >m</div>
		</div>
		<div class="line">
		  <div class="square" >P</div>
		  <div class="square" >a</div>
		  <div class="square" >u</div>
		  <div class="square" >l</div>
		</div>
	  </div>
	  <div class="under-container" style="height:10vh">
		<div class="mouse">
		  <div class="molette"></div>
		</div>
	  </div>
	  </div>
	</div>
	<div class="container" id="secondcontainer">
	  <div class="under-container">
		<div class="profil-picture" id="profilpicture">
		</div>
	  </div>
	</div>


	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>                       
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> 
	<script src="script.js"></script>
</body>
</html>
/*@import url('https://fonts.googleapis.com/css?family=Cabin:400,400i,500,500i,600,600i,700,700i|Monoton|Yellowtail');*/
@import url('https://fonts.googleapis.com/css?family=Quicksand:300,400,500,600,700,800,900&subset=latin-ext');

body {
  font-family:'Quicksand';
  margin:0;
}
.container {
  display:flex;
  justify-content:center;
  align-items:center;
  flex-direction:column;
  width:100vw;
  max-width:100%;
  height:100vh;
  /*background:url('https://images.unsplash.com/photo-1511227499331-25c621db940e?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=2e7e55bd948e728345b7ed558d550053&auto=format&fit=crop&w=1400&q=80');
  background-size:cover;
  background-position:50% 50%;*/
}
.gradient-purple-blue {
  background-image: linear-gradient(30deg, #8E78FF, #B9DEDB);
}
.under-container {
  width:100vw;
  max-width:100%;
  display:flex;
  justify-content:center;
  align-items:center;
  flex-direction:column;
}

.title {
  font-size:50px;
  color:white;
}

.menu {
  width:100vw;
  max-width:100%;
  display:flex;
  justify-content:space-around;
  position:fixed;
  transition:opacity 0.5s;
  z-index:1;
}

.menu li {
  padding:30px;
  list-style: none;
}

.menu li a {
  color:white;
  text-decoration:none;
  font-weight:900;
}


.line {
  display:flex;
  position:relative;
  z-index:3;
}

.square {
  font-size:100px;
  font-weight:900;
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  cursor:default;
  transition:all 0.3s;
  color:#fff;
}

.square:hover {
  color:#08FDD8;
}

@-webkit-keyframes rubberBand {
  0% {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1)
  }
  30% {
    -webkit-transform: scale3d(1.25, .75, 1);
    transform: scale3d(1.25, .75, 1)
  }
  40% {
    -webkit-transform: scale3d(0.75, 1.25, 1);
    transform: scale3d(0.75, 1.25, 1)
  }
  50% {
    -webkit-transform: scale3d(1.15, .85, 1);
    transform: scale3d(1.15, .85, 1)
  }
  65% {
    -webkit-transform: scale3d(.95, 1.05, 1);
    transform: scale3d(.95, 1.05, 1)
  }
  75% {
    -webkit-transform: scale3d(1.05, .95, 1);
    transform: scale3d(1.05, .95, 1)
  }
  100% {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1)
  }
}
@keyframes rubberBand {
  0% {
    -webkit-transform: scale3d(1, 1, 1);
    -ms-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1)
  }
  30% {
    -webkit-transform: scale3d(1.25, .75, 1);
    -ms-transform: scale3d(1.25, .75, 1);
    transform: scale3d(1.25, .75, 1)
  }
  40% {
    -webkit-transform: scale3d(0.75, 1.25, 1);
    -ms-transform: scale3d(0.75, 1.25, 1);
    transform: scale3d(0.75, 1.25, 1)
  }
  50% {
    -webkit-transform: scale3d(1.15, .85, 1);
    -ms-transform: scale3d(1.15, .85, 1);
    transform: scale3d(1.15, .85, 1)
  }
  65% {
    -webkit-transform: scale3d(.95, 1.05, 1);
    -ms-transform: scale3d(.95, 1.05, 1);
    transform: scale3d(.95, 1.05, 1)
  }
  75% {
    -webkit-transform: scale3d(1.05, .95, 1);
    -ms-transform: scale3d(1.05, .95, 1);
    transform: scale3d(1.05, .95, 1)
  }
  100% {
    -webkit-transform: scale3d(1, 1, 1);
    -ms-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1)
  }
}
.rubberBand {
  -webkit-animation-name: rubberBand;
  animation-name: rubberBand
}

.mouse {
  display:flex;
  width:30px;
  height:50px;
  border:2px solid #fff;
  border-radius:30px;
}

.molette {
  margin:12px auto auto auto;
  width:3px;
  height:3px;
  background-color:#fff;
  border: 1px solid #fff;
  border-radius: 90px;
  animation: scroll 2s ease infinite;
}

@keyframes scroll {
  0%{opacity:0; margin:10px auto auto auto;}
  10%{opacity:1;}
  50%{margin:10px auto auto auto;}
  90%{opacity:1;}
  100%{opacity:0; margin:18px auto auto auto;}
}

.mousetext{
  color:#fff;
  font-weight: 500;
}

/* bubble inspired by Mattia Astorino https://codepen.io/equinusocio/pen/jezBdZ*/

.bubble {
  position:relative;
}

.bubble::before
{
  content: '';
  position:absolute;
  z-index:2;
  top: 35%;
  left: 35%;
  transform: translate(-50%, -50%);
  display: block;
  width: 25vw;
  height: 25vw;
  min-height: 200px;
  min-width: 200px;
  background: linear-gradient(
    270deg,
    #43e97b,
    #38f9d7,
    #e0c3fc,
    #8ec5fc,
    #4facfe,
    #00f2fe,
    #a8edea,
    #fed6e3
  );
  background-size: 1600% 1600%;
  box-shadow: inset 0px -20px 100px 0px rgba(255, 255, 255, 0.48);
  animation: 
    transform 20s linear infinite alternate,
    movement 40s linear infinite alternate,
    shade 60s linear infinite alternate;
}

.bubble::after
{
  content: '';
  position:absolute;
  z-index:2;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  width: 15vw;
  height: 10vw;
  min-height: 200px;
  min-width: 200px;
  background: linear-gradient(
    270deg,
    #00f2fe,
    #8ec5fc,
    #38f9d7,
    #4facfe,
    #a8edea,
    #43e97b,
    #e0c3fc,
    #fed6e3
  );
  background-size: 1600% 1600%;
  box-shadow: inset 0px -20px 100px 0px rgba(255, 255, 255, 0.48);
  animation: 
    transform2 20s linear infinite alternate-reverse,
    movement 40s linear infinite alternate-reverse,
    shade 60s linear infinite alternate-reverse;
}

@keyframes transform
{
    0%,
  100% { border-radius: 33% 67% 70% 30% / 30% 30% 70% 70%; } 
   20% { border-radius: 37% 63% 51% 49% / 37% 65% 35% 63%; } 
   40% { border-radius: 36% 64% 64% 36% / 64% 48% 52% 36%; } 
   60% { border-radius: 37% 63% 51% 49% / 30% 30% 70% 70%; } 
   80% { border-radius: 40% 60% 42% 58% / 41% 51% 49% 59%; } 
}

@keyframes transform2 {
  0%{border-radius: 42% 58% 60% 40% / 32% 54% 46% 68%}
  20%{border-radius: 59% 41% 36% 64% / 32% 64% 36% 68%}
  40%{border-radius: 48% 52% 52% 48% / 54% 53% 47% 46%}
  60%{border-radius: 42% 58% 51% 49% / 63% 64% 36% 37%}
  80%{border-radius: 32% 68% 33% 67% / 63% 35% 65% 37%}
  100%{border-radius: 34% 66% 52% 48% / 34% 53% 47% 66%}
}
@keyframes movement
{
  from { -webkit-transform: rotate(-1turn) translateY(-50px); transform: rotate(-1turn) translateY(-50px); }
    to { -webkit-transform: none; transform: none; }
}
@keyframes shade
{
  0%, 100% { background-position: 0% 50%; }
       50% { background-position: 100% 50%; }
}
.profil-picture {
  display:flex;
  justify-content:center;
  align-items:center;
  width:150px;
  height:150px;
  border-radius:100%;
  background:linear-gradient(30deg, #232323, #B9BCC3);
  opacity:0;
}
.profilpicture-animation {
  animation:showprofil 0.5s forwards;
}
.profil-picture img{
  width:95%;
  height:95%;
  border-radius:100%;
}
@keyframes showprofil {
  0%{
    transform:translateY(-100%);
    opacity:0;
  }
  100%{
    transform:translateY(0%);
    opacity:1;
  }
}
var square = document.getElementsByClassName('square');

for(var i = 0; i<square.length; i++){
  square[i].addEventListener('mouseenter', function(){
    this.classList.add("rubberBand");
    this.addEventListener("animationend", function(){
      this.classList.remove("rubberBand");
    }, false);
  })
}
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