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HTML 

              
                <div id="login-container">
    <div class="card">
        <div class="card-content">
            <div class="login-side card-front flex-column-list">
                <div class="main-title-container col-md-12 text-center">
                    Cool Login
                </div>

                <form class="container-default-padding">
                    <div class="input-group">
                        <span class="input-group-addon" id="username-addon"><i class="fa fa-user"></i></span>
                        <input id="username" type="text" class="form-control" name="username" placeholder="Username" required/>
                    </div>

                    <div class="input-group">
                        <span class="input-group-addon" id="password-addon"><i class="fa fa-lock"></i></span>
                        <input id="password" type="password" class="form-control" name="password" placeholder="Password" required />
                    </div>

                    <div class="form-group no-margin">
                        <button type="submit" class="btn btn-primary pull-right">
                            <span>Login</span>
                        </button>
                    </div>
                </form>

                <div class="col-md-12 container-default-padding text-center">
                    <a class="flip-card">Have you forgotten your password?</a>
                </div>
            </div>

            <div class="recover-password-side card-back flex-column-list">
                <div class="main-title-container col-md-12 container-default-padding text-center">
                    Cool Login
                </div>

                <form name="recoverAccountForm" class="container-default-padding" novalidate>
                    <div class="col-md-12 no-padding">
                        <label class="text-secondary-dark text-font-weight">Enter your email and we will send you a new password for your account</label>
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon" id="email-addon"><i class="fa fa-envelope"></i></span>
                        <input id="email" type="text" class="form-control" name="email" placeholder="Email" required/>
                    </div>

                    <div class="form-group no-margin">
                        <button type="submit" class="btn btn-primary pull-right">
                            Send
                        </button>
                    </div>
                </form>

                <div class="col-md-12 container-default-padding text-center">
                    <a class="flip-card">Try to login again!</a>
                </div>
            </div>
        </div>
    </div>
</div>
!

CSS 

              
                /** CONTAINER **/
#login-container {
    position: relative;
    float: left;
    width: 100%;
    height: 100vh;

    background: transparent; /* For browsers that do not support gradients */
    background: -webkit-radial-gradient(circle, #c4d9b2 -10%, #ebf2e5 60%, transparent 90%); /* Safari 5.1-6.0 */
    background: -o-radial-gradient(circle, #c4d9b2 -10%, #ebf2e5 60%, transparent 90%); /* For Opera 11.6-12.0 */
    background: -moz-radial-gradient(circle, #c4d9b2 -10%, #ebf2e5 60%, transparent 90%); /* For Firefox 3.6-15 */
    background: radial-gradient(circle, #c4d9b2 -10%, #ebf2e5 60%, transparent 90%); /* Standard syntax */
    perspective: 600px;
    -webkit-perspective: 600px;
    -moz-perspective: 600px;
    -o-perspective: 600px;
    -ms-perspective: 600px;
}
/** CONTAINER **/

/** CARD **/
.card {
    width: 375px;
    height: 450px;
    margin: 0 auto;
    margin-top: calc(50vh - 225px);
    transform-style: preserve-3d;
    transition: transform 1s;
    transform-origin: center center;
    background: transparent;
    border: none;
}

.card .card-content {
    position:relative;
    width: 100%;
    height: 100%;

    background: #609831; /* For browsers that do not support gradients */
    background: -webkit-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Safari 5.1-6*/
    background: -o-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Opera 11.1-12*/
    background: -moz-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Fx 3.6-15*/
    background: linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Standard*/

    transition: 0.5s ease-out;
    -webkit-transition: 0.5s ease-out;
    -moz-transition: 0.5s ease-out;
    -o-transition: 0.5s ease-out;
    -ms-transition: 0.5s ease-out;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;

    /* content backface is visible so that static content still appears */
    backface-visibility: visible;
    -webkit-backface-visibility: visible;
    -moz-backface-visibility: visible;
    -o-backface-visibility: visible;
    -ms-backface-visibility: visible;
}

.card.flipped .card-content {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    -ms-transform: rotateY(180deg);
}

.card .card-content .card-front,
.card .card-content .card-back {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    padding: 20px;
    border: 2px solid #4c7927;
}

.card.flipped .card-content .card-front,
.card .card-content .card-back {
    /* Backface visibility works great for all but IE. As such, we mark the backface visible in IE and manage visibility ourselves */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -o-backface-visibility: hidden;
    -ms-backface-visibility: visible;
    position: absolute;
}

.card .card-content .card-front,
.card.flipped .card-content .card-front {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    -moz-transform: rotateY(0deg);
    -o-transform: rotateY(0deg);
    -ms-transform: rotateY(0deg);
}

.card .card-content .card-back,
.card.flipped .card-content .card-back {
    transform: rotateY(-180deg);
    -webkit-transform: rotateY(-180deg);
    -moz-transform: rotateY(-180deg);
    -o-transform: rotateY(-180deg);
    -ms-transform: rotateY(-180deg);
}

.card .card-content .card-front,
.card.flipped .card-content .card-back {
    /* IE Hack. Halfway through the card flip, set visibility. Keep other browsers visible throughout the card flip. */
    animation: stayvisible 0.5s both;
    -webkit-animation: stayvisible 0.5s both;
    -moz-animation: stayvisible 0.5s both;
    -o-animation: stayvisible 0.5s both;
    -ms-animation: donothing 0.5s;
    -ms-transition: visibility 0s linear 0.17s;
    visibility: visible;
}
.card.flipped .card-content .card-front,
.card .card-content .card-back {
    /* IE Hack. Halfway through the card flip, set visibility. Keep other browsers visible throughout the card flip. */
    animation: stayvisible 0.5s both;
    -webkit-animation: stayvisible 0.5s both;
    -moz-animation: stayvisible 0.5s both;
    -o-animation: stayvisible 0.5s both;
    -ms-animation: donothing 0.5s;
    -ms-transition: visibility 0s linear 0.17s;
    visibility: hidden;

    background: #609831; /* For browsers that do not support gradients */
    background: -webkit-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Safari 5.1-6*/
    background: -o-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Opera 11.1-12*/
    background: -moz-linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Fx 3.6-15*/
    background: linear-gradient(-60deg, #609831 -50%, #ebf2e5 150%); /*Standard*/
}
@keyframes stayvisible { from { visibility: visible; } to { visibility: visible; } }
@-webkit-keyframes stayvisible { from { visibility: visible; } to { visibility: visible; } }
@-moz-keyframes stayvisible { from { visibility: visible; } to { visibility: visible; } }
@-o-keyframes stayvisible { from { visibility: visible; } to { visibility: visible; } }
@-ms-keyframes donothing { 0% { } 100% { } }
/** CARD **/

/** LOGIN SIDE **/
#login-container .login-side { }

.main-title-container{ }

.input-group {
    margin-bottom: 10px;
}

.input-group-addon {
    width: 40px;
    border: 1px solid #4c7927;
    background-color: #4c7927;
    color: #ebf2e5;
    font-weight: bold;
    text-align: center;
    margin-right: -1px;
}

.input-group-addon + input {
    border: 1px solid #4c7927;
}

.help-block {
    position: relative;
    float: left;
    color: red;
    width: 250px;
    max-width: 250px;
}

.flip-card {
    cursor: pointer;
    color: #3f1e60!important;
    font-weight: bold;
}

.main-title-container {
    color: #3f1e60!important;
    font-weight: bold;
    font-size: 36px;
    font-family: Verdana, Geneva, sans-serif;
}

.text-secondary-dark{
  color: #4c7927;
}

.spin-animation {
    -webkit-animation:spin 4s linear infinite;
    -moz-animation:spin 4s linear infinite;
    animation:spin 4s linear infinite;
}
/** LOGIN SIDE **/

/** RECOVER PASSWORD SIDE **/

/** RECOVER PASSWORD SIDE **/

.flex-column-list {
  display: flex;
  flex-flow: column wrap;
  justify-content: between;
}

.flex-column-list > div:first-of-type {
  flex: 1 0 auto!important;
}

.flex-column-list > form {
  flex: 1 0 auto!important;
}

.flex-column-list > div:last-of-type {
  flex: 0 0 auto!important;
}

.pull-right {
  float: right;
}

.btn-primary {
  background-color: #3f1e60;
  border-color: #3f1e60;
  cursor: pointer;
}

.btn-primary:hover {
    background-color: #654a7f;
    border-color: #654a7f;
}

.no-padding {
  padding: 0;
}
!

JS 

              
                $(function() {
  $(".flip-card").on("click", function() {
    $(".card").toggleClass("flipped");
  });
});
!
999px

Console