.btn.fab
.overlay

#error.fab
#success.fab

.flip-container
  .flipper
    .front
      form.contact
        h1 Contact Us
          #close.close(title='Close')
        .group
          input(type="text" id="user" required )
          label(for="user") Name

        .group
          input(type="text" id="pass" required )
          label(for="pass") Email

        .group
          textarea(id='msg' required )
          label(for='msg') Your Message

        button(value='submit')
    .back
      .msg
        button.close Close
View Compiled
$color: #673AB7;

@mixin centered {
  margin: auto;
  position: absolute;
  top: 0; bottom: 0;
  left: 0; right: 0;
}

body {
  background: #ccc url('https://goo.gl/ApfO58') top center no-repeat;
  background-size:cover;
  min-height:100vh;
  margin: 0;
  color: white;
  font-family: Roboto;
}

.overlay {
  background: rgba(55, 58, 71, 0.9);
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0; left: 0;
  pointer-events: auto;
  transition: .3s;
  &.hidden {
    visibility: hidden;
    opacity: 0;
  }
}

.btn {
  @include centered;
  background: $color url('https://cbwconline.com/IMG/Codepen/Compose.svg') center no-repeat;
}

.fab {
  position: absolute;
  width: 56px;
  height: 56px;
  margin: auto;
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28);
  cursor: pointer;
  transition: .3s;
  &.hidden {
    opacity: 0;
    visibility: none;
  }
}

#error {
  background: #F44336 url('https://cbwconline.com/IMG/Codepen/error.svg') center no-repeat;
  top: 0; bottom: 0;
  right: 15px;
}

#success {
  background: #4CAF50 url('https://cbwconline.com/IMG/Codepen/Check.svg') center no-repeat;
  top: 0; bottom: 0;
  left: 15px;
}

.flip-container, .front, .back {
  width: 350px;
  height: 500px;
}

.flip-container {
  @include centered;
  perspective: 1000;
  transition: .3s;
  &.error .flipper {
  transform: rotateY(180deg); 
    .back {
      background: #F44336 url('https://cbwconline.com/IMG/Codepen/error.svg') 50% 56px no-repeat;
      background-size: 100px;
      button:hover {
        color: #F44336;
      }
    }
  }
  &.success .flipper {
  transform: rotateY(-180deg); 
    .back {
      background: #4CAF50 url('https://cbwconline.com/IMG/Codepen/Check.svg') 50% 56px no-repeat;
      background-size: 100px;
    }
  }
  &.hidden {
    visibility: hidden;
    opacity: 0;
    transform: translateY(-100px);
  }
}

.flipper {
  transition: 0.6s;
  transform-style: preserve-3d;
  position: relative;
}

.front, .back {
  backface-visibility: hidden !important;
  position: absolute;
  top: 0;
  left: 0;
  transition: 1s;
}

.back {
  background-position: 50% 0;
  transform: rotateY(-180deg);
  .msg {
    text-align: center;
    margin: 175px auto 0 auto;
    font-family: Roboto;
    max-width: 90%;
  }
  button.close {
    color: white;
    width: 100px;
    height: 46px;
    border: 2px solid white;
    outline: none;
    background: rgba(white, .2);
    font: 400 18px Roboto;
    transition: .2s;
    position: absolute;
    margin: auto;
    left: 0; right: 0;
    bottom: 100px;
    &:hover {
      color: #4CAF50;
      background: white;
    }
  }
}

// Form 

form {
  @include centered;
  overflow: hidden;
  background: #F9F9F9;
  width: 350px;
  height: 500px;
  border-radius: 3px;
  box-shadow: 0 3px 36px 0 rgba(0, 0, 0, 0.6);
  position: relative;
  backface-visibility: hidden;
  h1 {
  text-align: center;
  background: $color;
  margin: 0;
  padding: 8px;
  font: 300 20px Roboto;
  #close {
    display: block;
    position: absolute;
    cursor: pointer;
    top: 7px;
    right: 7px;
    width: 26px; height: 26px;
    border-radius: 50%;
    background: url('https://cbwconline.com/IMG/Close.svg') center no-repeat;
    transition: .2s;
    &:hover {
      background-color: rgba(white, .2);    }
  }
 }    
  
  button {
    display: block;
    cursor: pointer;
    width: 200px;
    height: 30px;
    color: white;
    background: $color url('https://cbwconline.com/IMG/Codepen/Check.svg') center no-repeat;
    margin: 15px auto;
    border: none;
    border-radius: 3px;
    box-shadow: 0 3px 6px 0 rgba(0,0,0,0.2);
    transition: all 0.3s ease-in-out;
    &:hover { 
      transform: translateY(-3px);
      box-shadow: 0 6px 6px 0 rgba(0,0,0,0.2);
    }
  }
}

.group {
  width: 250px;
  position: relative;
  margin: auto;
  backface-visibility: hidden;
}

label {
  position: absolute;
  top: 7px;
  font: 400 15px Roboto;
  color: #A9A9A9;
  cursor: text;
  transition: .2s;
}

input {
  display: block;
  width: 250px;
  padding: 5px 0;
  margin-top: 30px;
  border: none;
  border-bottom: solid 1px $color;
  background: linear-gradient(to bottom, transparent 92%, $color 8%) no-repeat;
  background-position: -300px 0;
  background-size: 300px 100%;
  font-size: 15px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  
  // Stop that awful pale yellow background on auto-fill
  &:-webkit-autofill {
    -webkit-box-shadow: 0 0 0px 1000px #F9F9F9 inset;
}
  
  &:focus, &:valid {
    background-position: 0 0;
    outline: none;
    
    ~label {
      top: -12px;
      font: 700 12px Roboto;
      color: $color;
    }
  }
}

textarea, textarea:focus {
  box-sizing: border-box;
  background: #F9F9F9;
  resize: none;
  border: 1px solid $color;
  outline: none;
  width: 250px;
  height: 250px;
  padding: 9px;
  font: 300 15px Roboto;
  margin-top: 30px;
  
  &:focus, &:valid {
    border: 3px solid $color;
    padding: 7px;
    
    ~label {
      top: 12px;
      left: 0;
      font: 700 12px Roboto;
      color: $color;
    }
  }
    
  ~label {
    display: block;
    top: 35px;
    left: 7px;   
  }
}
View Compiled
// Modal in/out animations

$("#close ,.close ,.overlay").on('click', function(){
  $(".flip-container ,.overlay ,#error ,#success").addClass("hidden");
  $(".flip-container").removeClass("success error")
})

$(".btn").on('click', function(){
  $(".flip-container ,.overlay , #error ,#success").removeClass("hidden");
})

// Error message

$("#error").on('click', function(){
  $(".flip-container").removeClass("success")
  $(".flip-container").toggleClass("error");
  $("#title").remove();
  $(".msg").append("<h2 id='title'>That's an Error</h2>");
})

// Success message

$("#success").on('click', function(){
  $(".flip-container").removeClass("error")
  $(".flip-container").toggleClass("success");
  $("#title").remove();
  $(".msg").append("<h2 id='title'>Message Sent</h2>");
})

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js