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HTML 

              
                <body ng-app="app">
  <form name="exampleForm" class="elegant-aero">
    <label>First Name:</label>
    <input type="text" name="userFirstName" ng-model="firstName" required />
    <div ng-messages="exampleForm.userFirstName.$error">
      <div ng-message="required">This field is required</div>
    </div>

    <label>Last Name:</label>
    <input type="text" name="userLastName" ng-model="lastName" required />
    <div ng-messages="exampleForm.userLastName.$error">
      <div ng-message="required">This field is required</div>
    </div>

    <label>Email Address:</label>
    <input type="email" name="userEmail" ng-model="email" required />
    <div ng-messages="exampleForm.userEmail.$error">
      <div ng-message="required">This field is required</div>
      <div ng-message="email">Your email address is invalid</div>
    </div>

    <label>Phone Number:</label>
    <input type="email" name="userPhoneNumber" ng-model="phoneNumber" ng-pattern="/^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$/" required/>
    <div ng-messages="exampleForm.userPhoneNumber.$error">
      <div ng-message="required">This field is required</div>
      <div ng-message="pattern">Must be a valid 10 digit phone number</div>
    </div>

    <label>User Message:</label>
    <textarea type="text" name="userMessage" class="form-control" rows="4" ng-model="message" ng-minlength="10" ng-maxlength="100" required></textarea>
    <div ng-messages="exampleForm.userMessage.$error">
      <div ng-message="required">This field is required</div>
      <div ng-message="minlength">Message must be over 10 characters</div>
      <div ng-message="maxlength">Message must not exceed 100 characters</div>
    </div>
  </form>
</body>
!

CSS 

              
                /* 
  Credit: http://www.sanwebe.com/2013/10/css-html-form-styles
*/

.elegant-aero {
  margin-left:auto;
  margin-right:auto;
  margin-top: 25px;
  max-width: 600px;
  background: #D2E9FF;
  padding: 20px 20px 20px 20px;
  font: 12px Arial, Helvetica, sans-serif;
  color: #666;
}

.elegant-aero label {
  display: block;
  margin: 0px 0px 5px;
}

.elegant-aero input[type="text"], .elegant-aero input[type="email"], .elegant-aero textarea {
  color: #888;
  width: 60%;
  padding: 0px 0px 0px 5px;
  border: 1px solid #C5E2FF;
  background: #FBFBFB;
  outline: 0;
  -webkit-box-shadow:inset 0px 1px 6px #ECF3F5;
  box-shadow: inset 0px 1px 6px #ECF3F5;
  font: 200 12px/25px Arial, Helvetica, sans-serif;
  height: 30px;
  line-height:15px;
  margin: 2px 6px 16px 0px;
}

.elegant-aero textarea{
  height:100px;
  padding: 5px 0px 0px 5px;
  width: 60%;
}

div{
  display:inline-block;
  vertical-align:top;
  color: red;
  margin-top: 5px;
}
!

JS 

              
                var app = angular.module('app', ['ngMessages']);
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999px

Console