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HTML 

              
                <body ng-app="MyApp">
  <div class="wrap" ng-controller="MainCtrl">
  
    <form name="formRegister" class="form--register"
            ng-submit="formRegister.$valid && !registerFormSubmitted && submitRegisterForm(user)" novalidate>
        <fieldset>
          <legend class="serif">Get on board!</legend>
          
          <div class="input-group" ng-class="{'input--filled' : user.name}">
            <input class="input__field" id="formRegisterName" type="text" 
                   ng-model="user.name" required>
            <label class="input__label" for="formRegisterName">
              <svg class="graphic" width="100%" height="100%" viewBox="0 0 404 77" preserveAspectRatio="none">
                <path d="m0,0l404,0l0,77l-404,0l0,-77z"></path>
              </svg>
              <span class="input__label-content">First Name *</span>
            </label>
          </div>
          
          <div class="input-group" ng-class="{'input--filled' : user.email}">
            <input class="input__field" id="formRegisterEmail" type="email" 
                   ng-model="user.email" required>
            <label class="input__label" for="formRegisterEmail">
              <svg class="graphic" width="100%" height="100%" viewBox="0 0 404 77" preserveAspectRatio="none">
                <path d="m0,0l404,0l0,77l-404,0l0,-77z"></path>
              </svg>
              <span class="input__label-content">E-mail address *</span>
            </label>
          </div>
        </fieldset>
          <p class="form__instructions">Fields with * are required.</p>

        <button class="button--submit"
                ng-class="{'disabled' : !formRegister.$valid, 'success': showSuccess }"
                type="submit">
                <span class="button--submit__label button--submit__default">
                  Submit
                </span>
                <span class="button--submit__label button--submit__success">
                  <i class="fa fa-check"></i> Yay, success!
                </span>
        </button>
      </form>
    
    </div>
</body>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=PT+Sans);
@import url(https://fonts.googleapis.com/css?family=Abril+Fatface);

$grad1: #49a09d;
$grad2: #5f2c82;

$color-positive: $grad1;
$color-negative: #A73030;

*, *:after, *:before {
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
}

html, body {
  min-height: 100%;
}

body {
  margin: 40px 20px 0;
  
  background: linear-gradient($grad1, $grad2);
  background-repeat: no-repeat;
  
  color: white;
  font-family: 'PT Sans', sans-serif;
  
  @media (min-width: 640px) {
    margin: 80px 40px 0;    
  }
}

.serif {
  font-family: 'Abril Fatface', cursive;
  letter-spacing: 0.05em;
}

.form--register {
  width: 400px;
  max-width: 95%;
  margin: auto;
  padding: 40px 20px;
  
  border: 1px solid white;
  
  @media (min-width: 640px) {
    padding: 60px 40px;    
  }
}

.form__instructions {
  color: white;
  text-align: right;
  font-size: 12px;
}

fieldset {
  margin: 0;
  padding: 0;
  border: none;
  font-size: 20px;
}

legend {
  margin-bottom: 20px;
  font-size: 1.2em;
  
  @media (min-width: 640px) {
    font-size: 1.7em;
  }
}

.input-group {
	display: inline-block;
  width: 100%;
  margin: 1.1em 0;
  
  position: relative;
	z-index: 1;

  text-transform: uppercase;
  vertical-align: top;
}

.input__field {
	display: block;
  width: 100%;
	padding: 0.8em;

  position: relative;
	float: right;

  background: transparent;
	border: 2px solid transparent;
	border-radius: 0;
	
  font-weight: bold;
	color: white;
	-webkit-appearance: none; /* for box shadows to show on iOS */
  
  &.ng-dirty.ng-invalid {
    box-shadow: 0 0 3px rgba($color-negative, 0.5);
    border: 2px solid rgba($color-negative, 0.5);
  }
  &.ng-dirty.ng-valid {
    &:not(.ng-empty) {
      box-shadow: 0 0 3px rgba($color-positive, 0.5);
      border: 2px solid rgba($color-positive, 0.5);
    }
  }
}

.input__field:focus {
	outline: none;
}

.input__label {
	display: inline-block;
	width: 100%;
	height: 100%;
	padding: 0;

  position: absolute;
  float: right;
	
  font-size: 70.25%;
	font-weight: bold;
	text-align: left;
	color: white;
	
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
	-webkit-touch-callout: none;
	user-select: none;
	cursor: text;
}

.input__label-content {
	position: relative;
	display: block;
	padding: 1.6em 0;
	width: 100%;
  
	transform-origin: 0% 50%;
	transition: transform 0.3s;
}

.graphic {
	position: absolute;
	top: 0;
	left: 0;

	fill: none;
	stroke: white;
	stroke-width: 4px;
	stroke-dasharray: 962;
	stroke-dashoffset: 558;

  transform: scale3d(1, -1, 1);
	transition: stroke-dashoffset 0.3s;

  pointer-events: none;
}


.input__field:focus + .input__label,
.ng-dirty + .input__label {
	cursor: default;
	pointer-events: none;
}

.input__field:focus + .input__label .graphic,
.ng-dirty + .input__label .graphic {
	stroke-dashoffset: 0;
}

.input__field:focus + .input__label .input__label-content,
.ng-dirty + .input__label .input__label-content {
	transform: scale3d(0.81, 0.81, 1) translate3d(0, -4em, 0);
}

.button--submit {
  height: 45px;
  margin-top: 20px;
  padding: 8px 30px;

  position: relative;

  background: transparent;
  border: 1px solid white;

  color: white;
  text-transform: uppercase;
  
  overflow: hidden;
  transition: 300ms ease all;
  transition: box-shadow 300ms ease-in-out, color 300ms 0 ease-in-out, opacity 300ms ease-in-out;
  
  &:not(.disabled):not(.success):hover {
    box-shadow: 0 0 40px 40px white inset;
    color: $grad1;
  }
  
  &:focus {
    outline: 1px solid rgba(white, 0.5);
  }

  //Disabled styles when form not valid
  &.disabled {
		opacity: 0.7;
		cursor: not-allowed;
		user-select: none;
    border: 1px dashed white;
	}
  
  //Styles for after form is sent
  &.success {
    cursor: not-allowed;
    background: $color-positive;
  }
}

.button--submit__label {
  display: block;
  transition: transform 300ms ease-out, opacity 300ms ease-out;  
}
//Submit label shown by default
.button--submit__default {
  position: relative;

  .success & {
    transform: translate3d(0, -100%, 0);
    opacity: 0;
    visibility: hidden;
  }
}

//Submit label shown on successful form submit
.button--submit__success {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;

  opacity: 0;
  visibility: hidden;
  transform: translate3d(0, 100%, 0);
  
  font-size: 13px;

  .success & {
    opacity: 1;
    visibility: visible;
    transform: translate3d(0, -50%, 0);
  }
}
!

JS 

              
                var app = angular.module('MyApp', []);

app.controller('MainCtrl', ['$scope', '$timeout', function ($scope, $timeout) {
  $scope.showSuccess = false;
  $scope.registerFormSubmitted = false;
  
  $scope.submitRegisterForm = function(user) {
    console.log('in function submitRegisterForm()', user);
    $scope.registerFormSubmitted = true;

    //Simulate form submission
    $timeout(function() {
      $scope.showSuccess = true;
    }, 500);
  };
  
}]);
!
999px

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