Форма для сайта на Bootstrap — стиль 13

Подробное описание и демонстрация работы блока «Формы» для сайта под номером №13 для библиотеки Bootstrap. Html и CSS код для реализации блока forms на сайте как на изображении.

<div class="form-bg">
    <div class="container">
        <div class="row">
            <div class="col-md-6">
                <form class="form-horizontal">
                    <div class="form-group">
                        <label for="exampleInputEmail1">Email</label>
                        <i class="fa fa-envelope-o"></i>
                        <input required="" name="login[username]" type="email" class="form-control" id="exampleInputEmail1" placeholder="Email">
                    </div>
                    <div class="form-group">
                        <label for="exampleInputPassword1">Password</label>
                        <i class="fa fa-lock"></i>
                        <input required="" name="login[password]" type="password" class="form-control" placeholder="Password">
                        <a href="#" class="forgot-pass">forgot?</a>
                    </div>
                    <div class="form-group">
                        <div class="signup">
                            No account?
                            <a href="#">signup</a>
                        </div>
                        <button type="submit" class="btn btn-default">login</button>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>

.form-bg{ background: #ddd; }
.form-horizontal{
    background: #fff;
    padding: 80px 50px;
}
.form-horizontal .form-group{
    margin: 0 0 30px 0;
    position: relative;
}
.form-horizontal .form-group:last-child{ margin: 40px 0 0 0; }
.form-horizontal .form-group i{
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-size: 18px;
    color: #c4c4c4;
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}
.form-horizontal .form-control{
    height: 50px;
    background: #fff;
    border: 2px solid #d9d9d9;
    box-shadow: none;
    padding: 0 20px 0 50px;
    font-size: 16px;
    color: #7f8291;
    position: relative;
    transition: all 0.3s ease 0s;
}
.form-horizontal .form-control[type=password]{ padding: 0 105px 0 50px; }
.form-horizontal .form-control:focus{
    box-shadow: none;
    outline: 0 none;
    border-color: #4b92e3;
}
.form-horizontal .form-control::-webkit-input-placeholder,
.form-horizontal .form-control::-moz-placeholder,
.form-horizontal .form-control::placeholder{ color: #c4c4c4; }
.form-horizontal .form-group label{
    padding: 0 7px;
    background: #4b92e3;
    font-size: 14px;
    color: #fff;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    border-radius: 3px;
    opacity: 0;
    z-index: 1;
    position: absolute;
    top: 9px;
    left: 15px;
    transition: all 0.3s ease 0s;
}
.form-horizontal .form-group:hover label{
    opacity: 1;
    top: -9px;
}
.form-horizontal .forgot-pass{
    padding: 5px 10px;
    font-size: 16px;
    font-weight: bold;
    color: #4b92e3;
    text-transform: capitalize;
    position: absolute;
    top: 50%;
    right: 10px;
    border-left: 1px solid #d8d8d8;
    transform: translateY(-50%);
}
.form-horizontal .signup{
    display: inline-block;
    font-size: 16px;
    color: #8f8f8f;
    text-transform: capitalize;
    margin-top: 8px;
}
.form-horizontal .signup a{ color: #4b92e3; }
.form-horizontal .btn{
    padding: 8px 30px;
    background: #4b92e3;
    float: right;
    border: none;
    font-size: 16px;
    font-weight: bold;
    color: #fff;
    border-radius: 6px;
    text-transform: uppercase;
}
.form-horizontal .btn:focus{
    background: #4b92e3;
    color: #fff;
}
@media only screen and (max-width: 479px){
    .form-horizontal{ padding: 40px 20px; }
    .form-horizontal .form-group:last-child{
        text-align: center;
        margin-top: 0;
    }
    .form-horizontal .signup{
        display: block;
        margin-bottom: 10px;
    }
    .form-horizontal .btn{ float: none; }
}