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              <header id="header">
  <div class="hidden-form">
    <div class="form">
      <div class="sign">
        <h3>SIGN UP</h3>
        <form>
          <input type="text" placeholder=" First name" />
          <input type="text" placeholder=" Last name" />
          <input type="email" placeholder=" Enter an email" />
          <input type="email" placeholder=" Re-enter email" />
          <input type="password" placeholder="Password" />
          <input type="submit" value="submit"/>
        </form>
        <p>Lorem ipsum dolor sit amet, ea doming<br /> epicuri iudicabit nam, te usu virtute placerat Purto<br /> brute disputando cu est.</p>
      </div>
    </div>
  </div>
  <div class="Img">
    <img id="image" src="http://www.up-9.com/uploads/148366123221741.png" />
  </div>
</header>
<section class="section">
  <div class="container">
    <div class="rect">
      <div class="circle">1</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">2</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">3</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">4</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">5</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">6</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">7</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
    <div class="rect">
      <div class="circle">8</div>
      <article>This's test for make an animation with pure Javascript code</article>
      <p>Mostafa Omar</p>
    </div>
  </div>
</section>
            
          
!
            
              * {
  padding: 0;
  margin: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
  font-family: arial, tahoma;
}
header {
  background-color: #13181b;
  height: 900px;
  overflow: hidden;
  position: relative;
}
header .Img {
  margin: auto;
  height: 80px;
  text-align: center;
  position: relative;
  top: 5%;
  z-index: 99999;
}
header .Img img {
  height: 100%;
  display: block;
  margin: auto;
  cursor: pointer;
}
.section {
  background-color: darkslategrey;
  height: auto;
  padding: 50px 0 150px;
  border-top: 10px solid #222;
}
.container {
  display: flex;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  display: -o-flex;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding-top: 0px;
}
.rect {
  margin: 20px;
  border-radius: 10px;
  width: 250px;
  height: 250px;
  background-color: #13181b;
  transition: all 2s ease-in-out;
  position: relative;
  top: 150px;
  opacity: 0;
}
.rect div {
  height: 50px;
  width: 100px;
  background-color: #777;
  margin: 25px auto 0;
  border-radius: 25px;
  text-align: center;
  line-height: 50px;
}
.rect p {
  color: #555;
  text-align: center;
  padding: 10px;
  font-size: 18px;
}
.rect article {
  font-size: 16px;
  text-align: center;
  color: #999;
  padding-top: 25px;
}
.show {
  opacity: 1;
  top: 0;
}


/*

End animate

-----------------

Start form

*/


.hidden-form {
  background-color: transparent;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  z-index: 999;
  transition: all .7s ease-in-out;
  width: 0;
  right: 0;
  overflow: hidden;
}
.form {
  color: #DDD;
  width: 100%;
  height: 100%;
  position: relative
}
.form h3 {
  font-size: 30px;
  text-align: center;
  margin: 170px auto 50px;
  width: 600px;
  /*                background: #DDd;*/
}
.form p {
  padding: 20px;
  line-height: 22px;
  width: 600px;
  margin: auto;
  text-align: center;
  font-style: italic;
  color: #AAA;
}
.sign {
  /*                background: #DDD;*/
  width: 600px;
  margin: auto;
  text-align: center;
  transform: rotate(-60deg);
  transition: all .7s ease-in-out;
}
.sign input {
  color: #DDD;
  background-color: rgba(96, 125, 139, 0.2);
  margin: 0 10px;
  height: 37px;
  width: 250px;
  outline: none;
  border: 1px solid #444;
  border-radius: 5px;
  padding-left: 5px;
  transition: all .7s ease-in-out;
}
.sign input[type="email"], .sign input[type="password"] {
  width: 525px;
  display: block;
  margin: 17px auto;
}
.sign input[type="submit"] {
  width: 525px;
  background-color: #3f51b5;
  font-size: 17px;
}
.sign input:focus:not([type="submit"]) {
  box-shadow: 0 0 7.5px darkseagreen;
  border: 1px solid darkseagreen;
}
.show-form {
  width: 100%;
}
.rotate {
  transform: rotate(0deg);
}
            
          
!
            
              
var header = document.getElementById("header"),

    rects = document.getElementsByClassName("rect"),

    calcHeader = header.offsetTop;
// While you are scrolling CHECK :D
window.onscroll = function () {

  'use strict';
  // check if document Body >= header offset top (height of header)
  if (document.body.scrollTop >= calcHeader) {

    var i;
    // Make a loop for run all classes with the same value
    for (i = 0; i < rects.length; i = i + 1) {
      // Add class show 
      rects[i].classList.add("show");

    }
  }

};

// End animate
// Start form

var image = document.getElementById("image"),

    hiddenForm = document.getElementsByClassName("hidden-form"),

    sign = document.getElementsByClassName("sign"),

    focus = document.querySelector("form");

image.onclick = function () {

  'use strict';

  hiddenForm[0].classList.toggle("show-form");

  sign[0].classList.toggle("rotate");

  focus.children[0].focus();

}; 
            
          
!
999px
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