How to make a Elegant Login Form in Pure HTML5 & CSS3

<form class="login">
  
  <fieldset>
    
  	<legend class="legend">Login</legend>
    
    <div class="input">
    	<input type="email" placeholder="Email" required />
      <span><i class="fa fa-envelope-o"></i></span>
    </div>
    
    <div class="input">
    	<input type="password" placeholder="Password" required />
      <span><i class="fa fa-lock"></i></span>
    </div>
    
    <button type="submit" class="submit"><i class="fa fa-long-arrow-right"></i></button>
    
  </fieldset>
  
  <div class="feedback">
  	login successful <br />
    redirecting...
  </div>
  
</form>

// Set background image (pattern)

*{
  -ms-box-sizing: border-box;
	-moz-box-sizing: border-box;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0;
}

html, body{
  width: 100%;
  height: 100%;
  background: url(https://subtlepatterns.com/patterns/sativa.png) repeat fixed;
  font-family: 'Open Sans', sans-serif;
  font-weight: 200;
}

// Start styles in form

.login{
  position: relative;
  top: 50%;
	width: 250px;
  display: table;
  margin: -150px auto 0 auto;
  background: #fff;
  border-radius: 4px;
}

.legend{
  position: relative;
  width: 100%;
  display: block;
  background: #FF7052;
  padding: 15px;
  color: #fff;
  font-size: 20px;
  
  &:after{
    content: "";
    background-image: url(http://simpleicon.com/wp-content/uploads/multy-user.png);
    background-size: 100px 100px;
    background-repeat: no-repeat;
    background-position: 152px -16px;
    opacity: 0.06;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
  }
}

.input{
  position: relative;
  width: 90%;
  margin: 15px auto;
  
  span{
    position: absolute;
    display: block;
    color: darken(#EDEDED, 10%);
    left: 10px;
    top: 8px;
    font-size: 20px;
  }
  
  input{
    width: 100%;
    padding: 10px 5px 10px 40px;
    display: block;
    border: 1px solid #EDEDED;
    border-radius: 4px;
    transition: 0.2s ease-out;
    color: darken(#EDEDED, 30%);
    
    &:focus{
      padding: 10px 5px 10px 10px;
      outline: 0;
      border-color: #FF7052;
    }
  }
}

.submit{
  width: 45px;
  height: 45px;
  display: block;
  margin: 0 auto -15px auto;
  background: #fff;
  border-radius: 100%;
  border: 1px solid #FF7052;
  color: #FF7052;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0px 0px 0px 7px #fff;
  transition: 0.2s ease-out;
  
  &:hover, &:focus{
    background: #FF7052;
    color: #fff;
    outline: 0;
  }
}

.feedback{
  position: absolute;
  bottom: -70px;
  width: 100%;
  text-align: center;
  color: #fff;
  background: #2ecc71;
  padding: 10px 0;
  font-size: 12px;
  display: none;
  opacity: 0;
  
  &:before{
    bottom: 100%;
    left: 50%;
    border: solid transparent;
    content: "";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    border-color: rgba(46, 204, 113, 0);
    border-bottom-color: #2ecc71;
    border-width: 10px;
    margin-left: -10px;
    
  }
}

$( ".input" ).focusin(function() {
  $( this ).find( "span" ).animate({"opacity":"0"}, 200);
});

$( ".input" ).focusout(function() {
  $( this ).find( "span" ).animate({"opacity":"1"}, 300);
});

$(".login").submit(function(){
  $(this).find(".submit i").removeAttr('class').addClass("fa fa-check").css({"color":"#fff"});
  $(".submit").css({"background":"#2ecc71", "border-color":"#2ecc71"});
  $(".feedback").show().animate({"opacity":"1", "bottom":"-80px"}, 400);
  $("input").css({"border-color":"#2ecc71"});
  return false;
});