<div class="login">
  <header class="header">
    <span class="text">LOGIN</span>
    <span class="loader"></span>
  </header>
  <form class="form">  
    <input class="input" type="text", placeholder="Username">
    <input class="input" type="password" placeholder="Password">
    <button class="btn" type="submit"></button>
  </form>
</div>
<button class ="resetbtn" type= "reset">Reset it
</button>

@import url(https://fonts.googleapis.com/css?family=Lobster);

* {
  margin: 0;
  padding: 0;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  user-select:none;
}

body {
  background: hsla(255, 255%, 255%, 1);
  font: 100%/1 'Lobster', cursive;
}

.login {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -10rem 0 0 -10rem;
  width: 20rem;
  height: 20rem;
  padding: 3em;
  background: hsla(255,255%,255%,1);
  border-radius: 50%;
  overflow: hidden;
  transition:all 1s ease;
}
.login:hover > .header, .login.clicked > .header {
  width: 2rem;
}
.login:hover > .header > .text, .login.clicked > .header > .text {
  font-size: 1rem;
  -webkit-transform: rotate(-90deg);
  transform: rotate(-90deg);
}
.login.loading > .header {
  width: 20rem;
  transition:all 1s ease;
}
.login.loading > .header > .text {
  display: none;
}
.login.loading > .header > .loader {
  display: block;
}
.header {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  width: 20rem;
  height: 20rem;
  background: hsla(0, 5%, 0%, 1);
  transition: width 0.5s ease-in-out;
}
.header > .text {
  display: block;
  width: 100%;
  height: 100%;
  font-size: 5rem;
  text-align: center;
  line-height: 20rem;
  color: hsla(255,255%,255%,1);
  transition: all 0.5s ease-in-out;
}
.header > .loader {
  display: none;
  position: absolute;
  left: 5rem;
  top: 5rem;
  width: 10rem;
  height: 10rem;
  border-left: 10px solid hsla(255, 255%, 255%, 1);
  border-bottom:10px solid hsla(255,255%,255%,1);
  border-right:10px solid hsla(255,255%,255%,1);
  border-top: 8px solid hsla(255,255%,255%,1);
  border-radius: 50%;
  box-shadow:inset 2px 2px 2px 2px hsla(0, 5%, 0%, 1);
  animation: loading 2s linear infinite;
}
.header > .loader:after {
  content: "";
  position: absolute;
  left: 4.15rem;
  top: -0.5rem;
  width: 1rem;
  height: 1rem;
  background: hsla(1, 75%, 55%, 1);
  border-radius: 50%;
  border-right: 1px solid hsla(1, 75%, 55%, 1);
  
}
.header > .loader:before {
  content: "";
  position: absolute;
  left: 3.4rem;
  top: -0.5rem;
  width: 0;
  height: 0;
  border-right: 1rem solid hsla(1, 75%, 55%, 1);
  border-top: 0.5rem solid transparent;
  border-bottom: 0.5rem solid transparent;
}

@keyframes loading {
  50% {
  border-left: 10px solid hsla(1, 95%, 25%, 1);
  border-bottom:10px solid hsla(1, 95%, 25%, 1);
  border-right:10px solid hsla(1, 95%, 25%, 1);
  border-top:8px solid hsla(1, 95%, 25%, 1);  
  }

  100% {
    transform: rotate(360deg);
  }
}
.form {
  margin: 0 0 0 2rem;
  padding: 0.5rem;
}

.input {
  display: block;
  width: 100%;
  font-size: 2rem;
  padding: 0.5rem 1rem;
  box-shadow: none;
  border-color: hsla(0, 5%, 0%, 1);
  border-width: 0 0 3px 0;
  transition: all .5s ease-in;
  outline:transparent;
}
.input + .input {
  margin: 10px 0 0;
}
.input:focus {
  border-bottom: 3px solid hsla(1, 75%, 55%, 1);
}

.btn {
  position: absolute;
  right: 7.8rem;
  bottom: 3rem;
  width: 4rem;
  height: 4rem;
  border: none;
  background: hsla(255, 255%, 255%, 1);
  font-size: 0;
  border: none;
  transition: all 0.3s ease-in-out;
}
.btn:after {
  content: "";
  position: absolute;
  left: 1.4rem;
  top: 1rem;
  width: 0;
  height: 0;
  border-left: 1.6rem solid hsla(1, 75%, 55%, 1);
  border-top: .8rem solid transparent;
  border-bottom: .8rem solid transparent;
  transition: border 0.3s ease-in-out 0s;
}
.btn:hover, .btn:focus, .btn:active {
  outline: none;
  
}
.btn:hover:after, .btn:focus:after, .btn:active:after {
  border-left-color: hsla(0, 5%, 0%, 1);
}
.resetbtn{
  margin:1%;
  border:none;
  padding:.5em;
  width:5em;
  background:hsla(0,0%,0%,1);
  color:hsla(255,255%,255%,1);
  font-size:1.5em;
  border-radius:2px;
  transition:all 1s ease-in-out;
  outline:none;
  box-shadow:0 0 1px 1px hsla(0,0%,0%,0.2);
}
.resetbtn:hover, .resetbtn:focus{
  background:hsla(255,255%,255%,1);
  color:hsla(0,0%,0%,1);
  outline:5px solid hsla(0,0%,0%,1);
}

$(document).ready(function() {
  $('.input').on('focus', function() {
    $('.login').addClass('clicked');
  });
  $('.login').on('submit', function(e) {
    e.preventDefault();
    $('.login').removeClass('clicked').addClass('loading');
  });
  $('.resetbtn').on('click', function(e){
      e.preventDefault();
    $('.login').removeClass('loading');
  });
});