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HTML 

              
                <div id="back">
  <canvas id="canvas" class="canvas-back"></canvas>
  <div class="backRight">    
  </div>
  <div class="backLeft">
  </div>
</div>

<div id="slideBox">
  <div class="topLayer">
    <div class="left">
      <div class="content">
        <h2>Sign Up</h2>
        <form id="form-signup" method="post" onsubmit="return false;">
          <div class="form-element form-stack">
            <label for="email" class="form-label">Email</label>
            <input id="email" type="email" name="email">
          </div>
          <div class="form-element form-stack">
            <label for="username-signup" class="form-label">Username</label>
            <input id="username-signup" type="text" name="username">
          </div>
          <div class="form-element form-stack">
            <label for="password-signup" class="form-label">Password</label>
            <input id="password-signup" type="password" name="password">
          </div>
          <div class="form-element form-checkbox">
            <input id="confirm-terms" type="checkbox" name="confirm" value="yes" class="checkbox">
            <label for="confirm-terms">I agree to the <a href="#">Terms of Service</a> and <a href="#">Privacy Policy</a></label>
          </div>
          <div class="form-element form-submit">
            <button id="signUp" class="signup" type="submit" name="signup">Sign up</button>
            <button id="goLeft" class="signup off">Log In</button> 
          </div>
        </form>
      </div>
    </div>
    <div class="right">
      <div class="content">
        <h2>Login</h2>
        <form id="form-login" method="post" onsubmit="return false;">
          <div class="form-element form-stack">
            <label for="username-login" class="form-label">Username</label>
            <input id="username-login" type="text" name="username">
          </div>
          <div class="form-element form-stack">
            <label for="password-login" class="form-label">Password</label>
            <input id="password-login" type="password" name="password">
          </div>
          <div class="form-element form-submit">
            <button id="logIn" class="login" type="submit" name="login">Log In</button>
            <button id="goRight" class="login off" name="signup">Sign Up</button>
          </div>
        </form>
      </div>
    </div>
  </div>
</div>

<!-- 

Remixed from "Sliding Login Form" Codepen by
C-Rodg (github.com/C-Rodg)
https://codepen.io/crodg/pen/yNKxej

Remixed from "Paper.js - Animated Shapes Header" Codepen by
Connor Hubeny (@cooper_hu)
https://codepen.io/cooper_hu/pen/ybxoev

Custom Checkbox based on the blog post by
Mik Ted (@inserthtml):
https://www.inserthtml.com/2012/06/custom-form-radio-checkbox/

HTML5 Form Validation based on the blog post by
Thoriq Firdaus (@tfirdaus):
https://webdesign.tutsplus.com/tutorials/
html5-form-validation-with-the-pattern-attribute--cms-25145

-->
!

CSS 

              
                $theme-signup: #03A9F4;
$theme-signup-darken: #0288D1;
$theme-signup-background: #2C3034;
$theme-login: #673AB7;
$theme-login-darken: #512DA8;
$theme-login-background: #f9f9f9;
$theme-dark: #212121;
$theme-light: #e3e3e3;
$font-default: 'Roboto', sans-serif;

$success: #5cb85c;
$error: #d9534f;

body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  width: 100% !important;
  box-sizing: border-box;
  font-family: $font-default;
}

.backRight {
  position: absolute;
  right: 0;
  width: 50%;
  height: 100%;
  background: $theme-signup;
}

.backLeft {
  position: absolute;
  left: 0;
  width: 50%;
  height: 100%;
  background: $theme-login;
}

#back {
  width: 100%;
  height: 100%;
  position: absolute;
  z-index: -999;
}

.canvas-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
}

#slideBox {
  width: 50%;
  max-height: 100%;
  height: 100%;
  overflow: hidden;
  margin-left: 50%;
  position: absolute;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
}

.topLayer {
  width: 200%;
  height: 100%;
  position: relative;
  left: 0;
  left: -100%;
}

label {
  font-size: 0.8em;
  text-transform: uppercase;
}

input {
  background-color: transparent;
  border: 0;
  outline: 0;
  font-size: 1em;
  padding: 8px 1px;
  margin-top: 0.1em;
}

.left {
  width: 50%;
  height: 100%;
  overflow: scroll;
  background: $theme-signup-background;
  left: 0;
  position: absolute;
  label {
    color: $theme-light;
  }
  input {
    border-bottom: 1px solid $theme-light;
    color: $theme-light;
    &:focus, &:active {
      border-color: $theme-signup;
      color: $theme-signup;
    }
    &:-webkit-autofill {
      -webkit-box-shadow: 0 0 0 30px $theme-signup-background inset;
      -webkit-text-fill-color: $theme-light;
    }
  }
  a {
    color: $theme-signup;
  }
}

.right {
  width: 50%;
  height: 100%;
  overflow: scroll;
  background: $theme-login-background;
  right: 0;
  position: absolute;
  label {
    color: $theme-dark;
  }
  input {
    border-bottom: 1px solid $theme-dark;
    &:focus, &:active {
      border-color: $theme-login;
    }
    &:-webkit-autofill {
      -webkit-box-shadow: 0 0 0 30px $theme-login-background inset;
      -webkit-text-fill-color: $theme-dark;
    }
  }
}

.content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100%;
  width: 80%;
  margin: 0 auto;
  position: relative;
}

.content h2 {
  font-weight: 300;
  font-size: 2.6em;
  margin: 0.2em 0 0.1em;
}

.left .content h2 {
  color: $theme-signup;
}

.right .content h2 {
  color: $theme-login;
}

.form-element {
  margin: 1.6em 0;
  &.form-submit {
    margin: 1.6em 0 0;
  }
}

.form-stack {
  display: flex;
  flex-direction: column;
}

.checkbox {
  -webkit-appearance: none;
  outline: none;
	background-color: $theme-light;
	border: 1px solid $theme-light;
	box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px -15px 10px -12px rgba(0,0,0,0.05);
	padding: 12px;
	border-radius: 4px;
	display: inline-block;
	position: relative;
}
.checkbox:focus, .checkbox:checked:focus,
.checkbox:active, .checkbox:checked:active {
  border-color: $theme-signup;
	box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px 1px 3px rgba(0,0,0,0.1);
}

.checkbox:checked {
  outline: none;
	box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px -15px 10px -12px rgba(0,0,0,0.05), inset 15px 10px -12px rgba(255,255,255,0.1);
}

.checkbox:checked:after {
  outline: none;
	content: '\2713';
  color: $theme-signup;
	font-size: 1.4em;
  font-weight: 900;
	position: absolute;
	top: -4px;
	left: 4px;
}

.form-checkbox {
  display: flex;
  align-items: center;
  
  label {
    margin: 0 6px 0;
    font-size: 0.72em;
  }
}

button {
  padding: 0.8em 1.2em;
  margin: 0 10px 0 0;
  width: auto;
  font-weight: 600;
  text-transform:  uppercase;
  font-size: 1em;
  color: #fff;
  line-height: 1em;
  letter-spacing: 0.6px;
  border-radius: 3px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1), 0 3px 6px rgba(0,0,0,0.1);
  border: 0;
  outline: 0;
  transition: all 0.25s;
  &.signup {
    background: $theme-signup;
  }
  &.login {
    background: $theme-login;
  }
  &.off {
    background: none;
    box-shadow: none;
    margin: 0;
    
    &.signup {
      color: $theme-signup;
    }
    &.login {
      color: $theme-login;
    }
  }
}

button:focus, button:active, button:hover {
  box-shadow: 0 4px 7px rgba(0,0,0,0.1), 0 3px 6px rgba(0,0,0,0.1);
  &.signup {
    background: $theme-signup-darken;
  }
  &.login {
    background: $theme-login-darken;
  }
  &.off {
    box-shadow: none;
    &.signup {
      color: $theme-signup;
      background: $theme-dark;
    }
    &.login {
      color: $theme-login-darken;
      background: $theme-light;
    }
  }
}

@media only screen and (max-width: 768px) {
  #slideBox {
    width: 80%;
    margin-left: 20%;
  }
  .signup-info, .login-info {
    display: none;
  }
}
!

JS 

              
                /* ====================== *
 *  Toggle Between        *
 *  Sign Up / Login       *
 * ====================== */
$(document).ready(function(){
  $('#goRight').on('click', function(){
    $('#slideBox').animate({
      'marginLeft' : '0'
    });
    $('.topLayer').animate({
      'marginLeft' : '100%'
    });
  });
  $('#goLeft').on('click', function(){
    if (window.innerWidth > 769){
      $('#slideBox').animate({
        'marginLeft' : '50%'
      });
    }
    else {
      $('#slideBox').animate({
        'marginLeft' : '20%'
      });
    }
    $('.topLayer').animate({
      'marginLeft': '0'
    });
  });
});

/* ====================== *
 *  Initiate Canvas       *
 * ====================== */
paper.install(window);
paper.setup(document.getElementById("canvas"));

// Paper JS Variables
var canvasWidth, 
    canvasHeight,
    canvasMiddleX,
    canvasMiddleY;

var shapeGroup = new Group();

var positionArray = [];

function getCanvasBounds() {
  // Get current canvas size
  canvasWidth = view.size.width;
  canvasHeight = view.size.height;
  canvasMiddleX = canvasWidth / 2;
  canvasMiddleY = canvasHeight / 2;
  // Set path position
  var position1 = {
    x: (canvasMiddleX / 2) + 100,
    y: 100, 
  };

  var position2 = {
    x: 200,
    y: canvasMiddleY, 
  };

  var position3 = {
    x: (canvasMiddleX - 50) + (canvasMiddleX / 2),
    y: 150, 
  };

  var position4 = {
    x: 0,
    y: canvasMiddleY + 100, 
  };

  var position5 = {
    x: canvasWidth - 130,
    y: canvasHeight - 75, 
  };

  var position6 = {
    x: canvasMiddleX + 80,
    y: canvasHeight - 50, 
  };
  
  var position7 = {
    x: canvasWidth + 60,
    y: canvasMiddleY - 50, 
  };
  
  var position8 = {
    x: canvasMiddleX + 100,
    y: canvasMiddleY + 100, 
  };

  positionArray = [position3, position2, position5, position4, position1, position6, position7, position8];
  };


/* ====================== *
 * Create Shapes          *
 * ====================== */
function initializeShapes() {
  // Get Canvas Bounds
  getCanvasBounds();

  var shapePathData = [
    'M231,352l445-156L600,0L452,54L331,3L0,48L231,352', 
    'M0,0l64,219L29,343l535,30L478,37l-133,4L0,0z', 
    'M0,65l16,138l96,107l270-2L470,0L337,4L0,65z',
    'M333,0L0,94l64,219L29,437l570-151l-196-42L333,0',
    'M331.9,3.6l-331,45l231,304l445-156l-76-196l-148,54L331.9,3.6z',
    'M389,352l92-113l195-43l0,0l0,0L445,48l-80,1L122.7,0L0,275.2L162,297L389,352',
    'M 50 100 L 300 150 L 550 50 L 750 300 L 500 250 L 300 450 L 50 100',
    'M 700 350 L 500 350 L 700 500 L 400 400 L 200 450 L 250 350 L 100 300 L 150 50 L 350 100 L 250 150 L 450 150 L 400 50 L 550 150 L 350 250 L 650 150 L 650 50 L 700 150 L 600 250 L 750 250 L 650 300 L 700 350 '
  ];

  for (var i = 0; i <= shapePathData.length; i++) {
    // Create shape
    var headerShape = new Path({
      strokeColor: 'rgba(255, 255, 255, 0.5)',
      strokeWidth: 2,
      parent: shapeGroup,
    });
    // Set path data
    headerShape.pathData = shapePathData[i];
    headerShape.scale(2);
    // Set path position
    headerShape.position = positionArray[i];
  }
};

initializeShapes();

/* ====================== *
 * Animation              *
 * ====================== */
view.onFrame = function paperOnFrame(event) {
  if (event.count % 4 === 0) {
    // Slows down frame rate
    for (var i = 0; i < shapeGroup.children.length; i++) {
      if (i % 2 === 0) {
        shapeGroup.children[i].rotate(-0.1);
      } else {
        shapeGroup.children[i].rotate(0.1);
      }
    }
  }
};

view.onResize = function paperOnResize() {
  getCanvasBounds();

  for (var i = 0; i < shapeGroup.children.length; i++) {
    shapeGroup.children[i].position = positionArray[i];
  }

  if (canvasWidth < 700) {
    shapeGroup.children[3].opacity = 0;
    shapeGroup.children[2].opacity = 0;
    shapeGroup.children[5].opacity = 0;
  } else {
    shapeGroup.children[3].opacity = 1;
    shapeGroup.children[2].opacity = 1;
    shapeGroup.children[5].opacity = 1;
  }
};
!
999px

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