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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div id="root"></div>
!

CSS 

              
                .container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  max-width: 500px;
  margin: 30vh auto;  
}
.form-div {
  z-index: 1;
}
.form-div, .button-div {
  transition: .5s ease-out;
}
form {
  border: 1px solid lightgray;
  border-radius: 5px;  
  display: flex;
  flex-direction: column;
  background-color: white;
}
input, button {
  margin: 5px;
}

/*SKELETON CSS*/

/*INPUT STYLING*/
input[type="text"],
input[type="password"],
textarea,
select {
  height: 38px;
  padding: 6px 10px; /* The 6px vertically centers text on FF, ignored by Webkit */
  background-color: #fff;
  border: 1px solid #D1D1D1;
  border-radius: 4px;
  box-shadow: none;
  box-sizing: border-box; }
input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
  border: 1px solid #2BCC9E;
  outline: 0; }

/*BUTTON STYLING*/
.button,
button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
  display: inline-block;
  height: 38px;
  padding: 0 30px;
  color: #555;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  line-height: 38px;
  letter-spacing: .1rem;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border-radius: 4px;
  border: 1px solid #bbb;
  cursor: pointer;
  box-sizing: border-box; }
.button:hover,
button:hover,
input[type="submit"]:hover,
input[type="reset"]:hover,
input[type="button"]:hover,
.button:focus,
button:focus,
input[type="submit"]:focus,
input[type="reset"]:focus,
input[type="button"]:focus {
  color: #333;
  border-color: #888;
  outline: 0; }
.button.button-primary,
button.button-primary,
input[type="submit"].button-primary,
input[type="reset"].button-primary,
input[type="button"].button-primary {
  color: #FFF;
  background-color: #2BCC9E;
  border-color: #2BCC9E; }
.button.button-primary:hover,
button.button-primary:hover,
input[type="submit"].button-primary:hover,
input[type="reset"].button-primary:hover,
input[type="button"].button-primary:hover,
.button.button-primary:focus,
button.button-primary:focus,
input[type="submit"].button-primary:focus,
input[type="reset"].button-primary:focus,
input[type="button"].button-primary:focus {
  color: #FFF;
  background-color: #3FB594;
  border-color: #3FB594; }
!

JS 

              
                class App extends React.Component {
  constructor() {
    super();    
    
    this.state = {form: 'login'};   
    
    // I like using objects to toggle values. We could just use true/false and just set to !self value as well. 
    this.toggle = {
      login: 'register',
      register: 'login'
    };
  }
  
  onSubmit(e) {
    e.preventDefault();
  }

  render() {    
    return (
      <div className="container">
        <div style={{transform: `translate(${this.state.form === 'login' ? 0 : 250}px, 0px)`}} className="form-div">
          <form onSubmit={this.onSubmit.bind(this)}>
            <input placeholder="Email" type="text" />
            <input placeholder="Password" type="password" />
            {this.state.form === 'login' ? '': <input placeholder="Re-typed password" type="password" />}
            <button className="button-primary">Submit</button>
          </form>
        </div>
        <div style={{transform: `translate(${this.state.form === 'login' ? 0 : -250}px, 0px)`}} className="button-div">
          <p>{this.state.form === 'login' ? 'Do not have an account?' : 'Already a member?'}</p>
          <button onClick={() => {this.setState({form: this.toggle[this.state.form]})}}>{this.toggle[this.state.form]}</button>
        </div>
      </div>
    );
  }
}
ReactDOM.render(<App />, document.querySelector("#root"));
!
999px

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