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HTML

              
                <section class="user">
  <div class="user_options-container">
    <div class="user_options-text">
      <div class="user_options-unregistered">
        <h2 class="user_unregistered-title">Don't have an account?</h2>
        <p class="user_unregistered-text">Create now!</p>
        <button class="user_unregistered-signup" id="signup-button">Sign up</button>
      </div>

      <div class="user_options-registered">
        <h2 class="user_registered-title">Already have a account!</h2>
        <p class="user_registered-text">Get started..</p>
        <button class="user_registered-login" id="login-button">Login</button>
      </div>
    </div>
    
    <div class="user_options-forms" id="user_options-forms">
      <div class="user_forms-login">
        <h2 class="forms_title">Login</h2>
        <form class="forms_form">
          <fieldset class="forms_fieldset">
            <div class="forms_field">
              <input type="email" placeholder="Email" class="forms_field-input" required autofocus />
            </div>
            <div class="forms_field">
              <input type="password" placeholder="Password" class="forms_field-input" required />
            </div>
          </fieldset>
          <div class="forms_buttons">
            <button type="button" class="forms_buttons-forgot">Forgot password?</button>
            <input type="submit" value="Log In" class="forms_buttons-action">
          </div>
        </form>
      </div>
      <div class="user_forms-signup">
        <h2 class="forms_title">Sign Up</h2>
        <form class="forms_form">
          <fieldset class="forms_fieldset">
            <div class="forms_field">
              <input type="text" placeholder="Full Name" class="forms_field-input" required />
            </div>
            <div class="forms_field">
              <input type="email" placeholder="Email" class="forms_field-input" required />
            </div>
            <div class="forms_field">
              <input type="password" placeholder="Password" class="forms_field-input" required />
            </div>
          </fieldset>
          <div class="forms_buttons">
            <input type="submit" value="Sign up" class="forms_buttons-action">
          </div>
        </form>
      </div>
    </div>
  </div>
</section>

              
            
!

CSS

              
                @charset "utf-8";
/* CSS Document */
* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

body {
  font-family: "Montserrat", sans-serif;
  font-size: 12px;
  line-height: 1em;
}

button {
  background-color: transparent;
  padding: 0;
  border: 0;
  outline: 0;
  cursor: pointer;
}

input {
  background-color: transparent;
  padding: 0;
  border: 0;
  outline: 0;
}
input[type="submit"] {
  cursor: pointer;
}
input::-webkit-input-placeholder {
  font-size: 0.85rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 300;
  letter-spacing: 0.1rem;
  color: #ccc;
}
input:-ms-input-placeholder {
  font-size: 0.85rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 300;
  letter-spacing: 0.1rem;
  color: #ccc;
}
input::-ms-input-placeholder {
  font-size: 0.85rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 300;
  letter-spacing: 0.1rem;
  color: #ccc;
}
input::placeholder {
  font-size: 0.85rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 300;
  letter-spacing: 0.1rem;
  color: #ccc;
}

/**
 * Bounce to the left side
 */
@-webkit-keyframes bounceLeft {
  0% {
    -webkit-transform: translate3d(100%, -50%, 0);
            transform: translate3d(100%, -50%, 0);
  }
  50% {
    -webkit-transform: translate3d(-30px, -50%, 0);
            transform: translate3d(-30px, -50%, 0);
  }
  100% {
    -webkit-transform: translate3d(0, -50%, 0);
            transform: translate3d(0, -50%, 0);
  }
}
@keyframes bounceLeft {
  0% {
    -webkit-transform: translate3d(100%, -50%, 0);
            transform: translate3d(100%, -50%, 0);
  }
  50% {
    -webkit-transform: translate3d(-30px, -50%, 0);
            transform: translate3d(-30px, -50%, 0);
  }
  100% {
    -webkit-transform: translate3d(0, -50%, 0);
            transform: translate3d(0, -50%, 0);
  }
}
/**
 * Bounce to the left side
 */
@-webkit-keyframes bounceRight {
  0% {
    -webkit-transform: translate3d(0, -50%, 0);
            transform: translate3d(0, -50%, 0);
  }
  50% {
    -webkit-transform: translate3d(calc(100% + 30px), -50%, 0);
            transform: translate3d(calc(100% + 30px), -50%, 0);
  }
  100% {
    -webkit-transform: translate3d(100%, -50%, 0);
            transform: translate3d(100%, -50%, 0);
  }
}
@keyframes bounceRight {
  0% {
    -webkit-transform: translate3d(0, -50%, 0);
            transform: translate3d(0, -50%, 0);
  }
  50% {
    -webkit-transform: translate3d(calc(100% + 30px), -50%, 0);
            transform: translate3d(calc(100% + 30px), -50%, 0);
  }
  100% {
    -webkit-transform: translate3d(100%, -50%, 0);
            transform: translate3d(100%, -50%, 0);
  }
}
/**
 * Show Sign Up form
 */
@-webkit-keyframes showSignUp {
  100% {
    opacity: 1;
    visibility: visible;
    -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
  }
}
@keyframes showSignUp {
  100% {
    opacity: 1;
    visibility: visible;
    -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
  }
}
/**
 * Page background
 */
.user {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  width: 100%;
  height: 100vh;
  background: #dcdef2;
  background-size: cover;
}
.user_options-container {
  position: relative;
  width: 80%;
}
.user_options-text {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  width: 100%;
  background-color: rgba(34, 34, 34, 0.85);
  border-radius: 3px;
}

/**
 * Registered and Unregistered user box and text
 */
.user_options-registered,
.user_options-unregistered {
  width: 50%;
  padding: 75px 45px;
  color: #fff;
  font-weight: 300;
}

.user_registered-title,
.user_unregistered-title {
  margin-bottom: 15px;
  font-size: 1.66rem;
  line-height: 1em;
}

.user_unregistered-text,
.user_registered-text {
  font-size: 0.83rem;
  line-height: 1.4em;
}

.user_registered-login,
.user_unregistered-signup {
  margin-top: 30px;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 10px 30px;
  color: #fff;
  text-transform: uppercase;
  line-height: 1em;
  letter-spacing: 0.2rem;
  -webkit-transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
  transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}
.user_registered-login:hover,
.user_unregistered-signup:hover {
  color: rgba(34, 34, 34, 0.85);
  background-color: #ccc;
}

/**
 * Login and signup forms
 */
.user_options-forms {
  position: absolute;
  top: 50%;
  left: 30px;
  width: calc(50% - 30px);
  min-height: 420px;
  background-color: #fff;
  border-radius: 3px;
  -webkit-box-shadow: 2px 0 15px rgba(0, 0, 0, 0.25);
          box-shadow: 2px 0 15px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  -webkit-transform: translate3d(100%, -50%, 0);
          transform: translate3d(100%, -50%, 0);
  -webkit-transition: -webkit-transform 0.4s ease-in-out;
  transition: -webkit-transform 0.4s ease-in-out;
  transition: transform 0.4s ease-in-out;
  transition: transform 0.4s ease-in-out, -webkit-transform 0.4s ease-in-out;
}
.user_options-forms .user_forms-login {
  -webkit-transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out;
  transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out;
}
.user_options-forms .forms_title {
  margin-bottom: 45px;
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1em;
  text-transform: uppercase;
  color: #e8716d;
  letter-spacing: 0.1rem;
}
.user_options-forms .forms_field:not(:last-of-type) {
  margin-bottom: 20px;
}
.user_options-forms .forms_field-input {
  width: 100%;
  border-bottom: 1px solid #ccc;
  padding: 6px 20px 6px 0;
  font-family: "Montserrat", sans-serif;
  font-size: 1rem;
  font-weight: 300;
  color: gray;
  letter-spacing: 0.1rem;
  -webkit-transition: border-color 0.2s ease-in-out;
  transition: border-color 0.2s ease-in-out;
}
.user_options-forms .forms_field-input:focus {
  border-color: gray;
}
.user_options-forms .forms_buttons {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  margin-top: 35px;
}
.user_options-forms .forms_buttons-forgot {
  font-family: "Montserrat", sans-serif;
  letter-spacing: 0.1rem;
  color: #ccc;
  text-decoration: underline;
  -webkit-transition: color 0.2s ease-in-out;
  transition: color 0.2s ease-in-out;
}
.user_options-forms .forms_buttons-forgot:hover {
  color: #b3b3b3;
}
.user_options-forms .forms_buttons-action {
  background-color: #e8716d;
  border-radius: 3px;
  padding: 10px 35px;
  font-size: 1rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 300;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  -webkit-transition: background-color 0.2s ease-in-out;
  transition: background-color 0.2s ease-in-out;
}
.user_options-forms .forms_buttons-action:hover {
  background-color: #e14641;
}
.user_options-forms .user_forms-signup,
.user_options-forms .user_forms-login {
  position: absolute;
  top: 70px;
  left: 40px;
  width: calc(100% - 80px);
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out, -webkit-transform 0.5s ease-in-out;
  transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out, -webkit-transform 0.5s ease-in-out;
  transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out, transform 0.5s ease-in-out;
  transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out, transform 0.5s ease-in-out, -webkit-transform 0.5s ease-in-out;
}
.user_options-forms .user_forms-signup {
  -webkit-transform: translate3d(120px, 0, 0);
          transform: translate3d(120px, 0, 0);
}
.user_options-forms .user_forms-signup .forms_buttons {
  -webkit-box-pack: end;
      -ms-flex-pack: end;
          justify-content: flex-end;
}
.user_options-forms .user_forms-login {
  -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
  opacity: 1;
  visibility: visible;
}

/**
 * Triggers
 */
.user_options-forms.bounceLeft {
  -webkit-animation: bounceLeft 1s forwards;
          animation: bounceLeft 1s forwards;
}
.user_options-forms.bounceLeft .user_forms-signup {
  -webkit-animation: showSignUp 1s forwards;
          animation: showSignUp 1s forwards;
}
.user_options-forms.bounceLeft .user_forms-login {
  opacity: 0;
  visibility: hidden;
  -webkit-transform: translate3d(-120px, 0, 0);
          transform: translate3d(-120px, 0, 0);
}
.user_options-forms.bounceRight {
  -webkit-animation: bounceRight 1s forwards;
          animation: bounceRight 1s forwards;
}

/**
 * Responsive 990px
 */
@media screen and (max-width: 990px) {
  .user_options-forms {
    min-height: 350px;
  }
  .user_options-forms .forms_buttons {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
  }
  .user_options-forms .user_forms-login .forms_buttons-action {
    margin-top: 30px;
  }
  .user_options-forms .user_forms-signup,
  .user_options-forms .user_forms-login {
    top: 40px;
  }

  .user_options-registered,
  .user_options-unregistered {
    padding: 50px 45px;
  }
}
              
            
!

JS

              
                const signupButton = document.getElementById("signup-button"),
  loginButton = document.getElementById("login-button"),
  userForms = document.getElementById("user_options-forms");

/**
 * Add event listener to the "Sign Up" button
 */
signupButton.addEventListener(
  "click",
  ()=>{
    userForms.classList.remove("bounceRight");
    userForms.classList.add("bounceLeft");
  },
  false
);

/**
 * Add event listener to the "Login" button
 */
loginButton.addEventListener(
  "click",
  () => {
    userForms.classList.remove("bounceLeft");
    userForms.classList.add("bounceRight");
  },
  false
);
              
            
!
999px

Console