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              <div class="cont_principal">

  <div class="cont_centrar">
  <div class="cont_login">
    <form action="">
    <div class="cont_tabs_login">
      <ul class='ul_tabs'>
        <li class="active"><a href="#" onclick="sign_in()">SIGN IN</a>
        <span class="linea_bajo_nom"></span>
        </li>
        <li><a href="#up" onclick="sign_up()">SIGN UP</a><span class="linea_bajo_nom"></span>
        </li>
      </ul>
      </div>
  <div class="cont_text_inputs">
      <input type="text" class="input_form_sign " placeholder="NAME" name="name_us" />
    
    <input type="text" class="input_form_sign d_block active_inp" placeholder="EMAIL" name="emauil_us" />

    <input type="password" class="input_form_sign d_block  active_inp" placeholder="PASSWORD" name="pass_us" />  
   <input type="password" class="input_form_sign" placeholder="CONFIRM PASSWORD" name="conf_pass_us" />
    
    <a href="#" class="link_forgot_pass d_block" >Forgot Password ?</a>    
<div class="terms_and_cons d_none">
    <p><input type="checkbox" name="terms_and_cons" /> <label for="terms_and_cons">Accept  Terms and Conditions.</label></p>
  
    </div>
      </div>
<div class="cont_btn">
     <button class="btn_sign">SIGN IN</button>
      
      </div>
      
    </form>
    </div>
    
  </div>
  

</div>
            
          
!
            
              * {
  margin: 0px auto;
  padding: 0px;
  font-family: 'Open Sans', sans-serif;
}
.cont_principal {
  position: absolute;
  width: 100%;
  height: 100%;
/* Rectangle 3: */
background-image: linear-gradient(-87deg, #F2F5F6 0%, #DDE5E8 100%);
}

.cont_centrar {
  position: absolute;
  width: 320px;
  left:50%;
  top:50%;
  margin-left: -160px;
  margin-top: -160px;
}

.cont_centrar {
  position: relative;
  width: 320px;
  float: left;
  background-image: linear-gradient(-226deg, #FFFFFF 8%, #EEF3F5 100%);

  border-radius: 8px;
transition: all 0.5s;
}

.cent_active {
    box-shadow: 5px 5px 10px 0px rgba(0,0,0,0.21);
}


.cont_tabs_login {
position: relative;
  float: left;
  width: 100%;
}

.ul_tabs > li { 
position: relative;
  float: left;
  width: 50%;
  list-style: none;
  text-align: center;

}

.ul_tabs > li > a  {  
text-decoration: none;
font-family: Helvetica;
font-size: 16px;
    color: #999;
line-height: 14px;
padding: 20px ;
display: block;
transition: all 0.5s;
}

  .ul_tabs > .active > a  {  
color: #FF8383;

}

.linea_bajo_nom {
  position: relative;
  width: 100%;
  float: left;
  background-color: #999;
  height: 2px;
}

.active .linea_bajo_nom {
  position: relative;
  width: 100%;
  float: left;
background-color: #FF8383;
height: 2px;
}

.cont_text_inputs {
position: relative;
  float: left;
  width: 100%;
  margin-top: 20px;
}

.input_form_sign {
  position: relative;
  float: left;
  width: 90%;
  border: none;
  border-bottom: 1px solid #B0BEC5 ;
  background-color: transparent;
  font-size: 14px;
  outline: none;
  transition: all 0.5s;
    height: 0px;
    margin: 0px;
    padding: 0px;  
opacity: 0;
display: none;
}

.active_inp {
  margin: 5% 5% ;  
  padding: 10px 0px;
  opacity: 1;
height: 5px;
}



.input_form_sign:focus {
  border-bottom: 1px solid #FF8383 ;}

.link_forgot_pass {
position: relative;
  margin-top: 0px;
  margin-left: 30%;
  text-decoration: none;
  color: #999;
  font-size: 13px;
  display: none;
  float: left;
  transition: all 0.5s;
}
.cont_btn {
  position: relative;
  float: left;
}

.btn_sign {
  background: rgba(255,64,88,0.74);
  box-shadow: 0px 2px 20px 2px rgba(255,114,132,0.50);
  border-radius: 8px;
  padding: 15px 30px;
  border: none;
  color: #fff;
  font-size: 14px;
  position: relative;  
  float: left;
  margin-left: 100px;
  margin-top: 20px;
  margin-bottom: 20px;
  cursor: pointer;
}

.terms_and_cons {
  width: 70%;  
  color: #999;
  font-size: 13px;
  transition: all 0.5s;
}

.d_none {
  display: none;
}

.d_block {
  display: block;
}

.cont_text_inputs > input:nth-child(1){
  transition-delay: 0.2s;
}

.cont_text_inputs > input:nth-child(2){
  transition-delay: 0.4s;
}
.cont_text_inputs > input:nth-child(3){
  transition-delay: 0.6s;
}
.cont_text_inputs > input:nth-child(4){
  transition-delay: 0.8s;
}
 
            
          
!
            
              function sign_up(){
  var inputs = document.querySelectorAll('.input_form_sign');
document.querySelectorAll('.ul_tabs > li')[0].className=""; 
document.querySelectorAll('.ul_tabs > li')[1].className="active"; 
  
  for(var i = 0; i < inputs.length ; i++  ) {
if(i == 2  ){

}else{  
document.querySelectorAll('.input_form_sign')[i].className = "input_form_sign d_block";
}
} 

setTimeout( function(){
for(var d = 0; d < inputs.length ; d++  ) {
 document.querySelectorAll('.input_form_sign')[d].className = "input_form_sign d_block active_inp";  
   }


 },100 );
 document.querySelector('.link_forgot_pass').style.opacity = "0";
   document.querySelector('.link_forgot_pass').style.top = "-5px";
   document.querySelector('.btn_sign').innerHTML = "SIGN UP";    
  setTimeout(function(){

 document.querySelector('.terms_and_cons').style.opacity = "1";
  document.querySelector('.terms_and_cons').style.top = "5px";
 
  },500);
  setTimeout(function(){
    document.querySelector('.link_forgot_pass').className = "link_forgot_pass d_none";
 document.querySelector('.terms_and_cons').className = "terms_and_cons d_block";
  },450);

}



function sign_in(){
  var inputs = document.querySelectorAll('.input_form_sign');
document.querySelectorAll('.ul_tabs > li')[0].className = "active"; 
document.querySelectorAll('.ul_tabs > li')[1].className = ""; 
  
  for(var i = 0; i < inputs.length ; i++  ) {
switch(i) {
    case 1:
 console.log(inputs[i].name);
        break;
    case 2:
 console.log(inputs[i].name);
    default: 
document.querySelectorAll('.input_form_sign')[i].className = "input_form_sign d_block";
}
} 

setTimeout( function(){
for(var d = 0; d < inputs.length ; d++  ) {
switch(d) {
    case 1:
 console.log(inputs[d].name);
        break;
    case 2:
 console.log(inputs[d].name);

    default:
 document.querySelectorAll('.input_form_sign')[d].className = "input_form_sign d_block";  
 document.querySelectorAll('.input_form_sign')[2].className = "input_form_sign d_block active_inp";  

   }
  }
 },100 );

 document.querySelector('.terms_and_cons').style.opacity = "0";
  document.querySelector('.terms_and_cons').style.top = "-5px";

  setTimeout(function(){
 document.querySelector('.terms_and_cons').className = "terms_and_cons d_none"; 
document.querySelector('.link_forgot_pass').className = "link_forgot_pass d_block";

 },500);

  setTimeout(function(){

 document.querySelector('.link_forgot_pass').style.opacity = "1";
   document.querySelector('.link_forgot_pass').style.top = "5px";
    

for(var d = 0; d < inputs.length ; d++  ) {

switch(d) {
    case 1:
 console.log(inputs[d].name);
        break;
    case 2:
 console.log(inputs[d].name);

         break;
    default:
 document.querySelectorAll('.input_form_sign')[d].className = "input_form_sign";  
}
  }
   },1500);
   document.querySelector('.btn_sign').innerHTML = "SIGN IN";    
}


window.onload =function(){
  document.querySelector('.cont_centrar').className = "cont_centrar cent_active";

}



            
          
!
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