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CSS

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JavaScript

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HTML 

              
                <div class="container">

    <form id="contact" name="contact">
      <ul>
        <li>
          <label></label>
          <input placeholder="Nom" type="text" id="name" name="nom" required/>
        </li>                    
        <li>
          <label></label>
          <input placeholder="Email" type="text" name="email" required/>
        </li>
        <li>
          <label></label>
          <input placeholder="Telephone" type="text" name="tel" required/>
        </li>
        <li>
          <label></label>
          <input placeholder="Entreprise" type="text" name="entreprise" id="entreprise" required/>
        </li>
        <li>
          <label></label>
          <textarea id="message" rows="5" cols="45" name="message" placeholder="Votre message" required></textarea>
        </li>
      </ul>
      <input class="submit" type="submit" value="Submit">
      
    </form>
  <div id="msgSubmit" class="hidden">
    <p class="blue">Merci ! Votre message est bien envoyé.<br/>
      Nous revenons vers vous dans les plus brefs délais.</p>
  </div>
!

CSS 

              
                body{
 background: #f3eee4;
}
.container{
  padding:100px;
}
#contact{
  max-width:400px;
  padding:20px;
  background-color:#ffffff;
  margin:auto;
}
ul{
  list-style:none;
  padding:0;
  margin:0
}
input{
  border:1px solid #f7f7f7;
  border-radius:8px;
  padding:10px;
  width:100%;
}
textarea{
  border:1px solid #f7f7f7;
  width:100%;
  ouline:none
}
.hidden{
  display:none;
  visibility:hidden;
}
.error {
  color: #ff0000;
}
.submit{
  margin-top:30px;
  width:150px;
  margin:30px 0;
  background-color:black;
  color:white;
  background: #24C6DC;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #514A9D, #24C6DC);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #514A9D, #24C6DC); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
.mandatory{
		font-size:1.3em;
		margin: 50px 0;
		font-weight: normal;
  text-align:center;
}
!

JS 

              
                
// Wait for the DOM to be ready
$(function() {
  // Initialize form validation on the registration form.
  // It has the name attribute "registration"
  $("form[name='contact']").validate({
    // Specify validation rules
    rules: {
      // The key name on the left side is the name attribute
      // of an input field. Validation rules are defined
      // on the right side
      nom: "required",
      prenom: "required",
      tel:{
       required: true,
      number: true
      },
      email: {
        required: true,
        // Specify that email should be validated
        // by the built-in "email" rule
        email: true
      },
      message:"required"
    },
    // Specify validation error messages
    messages: {
      nom: "veuillez insérer votre nom",
      prenom: "veuillez insérer votre prénom",
      entreprise:"veuillez indiquer une entreprise",
      tel: 'veuillez insérer un numéro de téléphone',
      email: "veuillez insérer une adresse mail valide",
      message:"veuillez remplir ce champ"
    },
    // Make sure the form is submitted to the destination defined
    // in the "action" attribute of the form when valid
    submitHandler: function(form) {
      form.submit();
    }
  });
});
!
999px

Console