Форма для сайта на Bootstrap — стиль 7

Подробное описание и демонстрация работы блока «Формы» для сайта под номером №3 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-offset-2 col-md-8">
                <form class="form-horizontal">
                    <div class="header">Registration</div>
                    <div class="form-content">
                        <div class="form-group">
                            <div class="col-sm-6">
                                <input class="form-control" id="exampleInputName2" placeholder="username" type="text">
                                <label class="control-label" for="exampleInputName2"><i class="fa fa-user"></i></label>
                            </div>
 
                            <div class="col-sm-6">
                                <input class="form-control" id="exampleInputName2" placeholder="email" type="email">
                                <label class="control-label" for="exampleInputName2"><i class="fa fa-envelope-o"></i></label>
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-6">
                                <input class="form-control" id="exampleInputName2" placeholder="password" type="password">
                                <label class="control-label" for="exampleInputName2"><i class="fa fa-lock"></i></label>
                            </div>
 
                            <div class="col-sm-6">
                                <input class="form-control" id="exampleInputName2" placeholder="confirm password" type="password">
                                <label class="control-label" for="exampleInputName2"><i class="fa fa-unlock"></i></label>
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-6">
                                <input class="form-control name" id="exampleInputName2" placeholder="first-name" type="text">
                            </div>
 
                            <div class="col-sm-6">
                                <input class="form-control name" id="exampleInputName2" placeholder="last-name" type="text">
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-12">
                                <select class="form-control">
                                    <option value="none" selected="">select gender...</option>
                                    <option value="male">male</option>
                                    <option value="female">female</option>
                                    <option value="other">other</option>
                                </select>
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-2 col-xs-3 captcha">
                                <label class="captcha">19 + 3 = </label>
                            </div>
 
                            <div class="col-sm-10 col-xs-9 captcha-text">
                                <input class="form-control name" placeholder="solve the captcha" type="text">
                            </div>
                        </div>
                    </div>
                    <div class="footer clearfix">
                        <button type="submit" class="btn btn-default">Register</button>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>

.form-bg{
    background: linear-gradient(to right,#7cacdc,#e0e5eb);
}
form{
    font-family: 'Roboto', sans-serif;
}
.form-horizontal .header{
    background: #b5953f;
    padding: 30px 25px;
    font-size: 30px;
    color: #fff;
    text-transform: uppercase;
    border-radius: 3px 3px 0 0;
}
.form-horizontal .form-content{
    padding: 25px;
    background: #f9fafd;
}
.form-horizontal .form-control{
    padding: 10px 50px 10px 15px;
    height: 50px;
    font-size: 18px;
    color: #000;
    border: 2px solid #acacac;
    margin-bottom: 15px;
}
.form-horizontal .form-control:hover{
    border-color: #c9af67;
}
.form-horizontal .form-control:focus{
    border-color: #b5953f;
    box-shadow: none;
}
.form-horizontal .control-label{
    width: 42px;
    height: 40px;
    font-size: 17px;
    color: #acacac;
    border-left: 1px solid #acacac;
    position: absolute;
    top: 5px;
    right: 20px;
    text-align: center;
}
.form-horizontal .captcha{
    padding-right: 0;
}
.form-horizontal .captcha label{
    background: #e0e0e0;
    display: block;
    height: 50px;
    font-size: 16px;
    color: #acacac;
    line-height: 45px;
    text-align: center;
    border-radius: 3px 0 0 3px;
}
.form-horizontal .captcha-text{
    padding-left: 0;
}
.form-horizontal .captcha-text input{
    border-radius: 0 3px 3px 0;
}
.form-horizontal .footer{
    background: #e8eaf6;
    border-top: 1px solid #b5953f;
    padding: 10px 25px;
}
.form-horizontal .footer .btn{
    background: #b5953f;
    font-size: 18px;
    color: #fff;
    float: right;
    margin: 10px 0;
    clear: both;
    padding: 10px 25px;
    transition: all 0.5s ease 0s;
}
.form-horizontal .name{
    padding: 10px 15px;
}
@media only screen and (max-width:767px){
    .form-horizontal .control-label i{
        line-height: 40px;
    }
    .form-horizontal .captcha label{
        font-size: 13px;
    }
}