Форма для сайта на Bootstrap — стиль 17

Подробное описание и демонстрация работы блока «Формы» для сайта под номером №17 для библиотеки Bootstrap. Html и CSS код для реализации блока forms на сайте как на изображении.

html разметка и css стили для реализации блока «Форма для сайта»

<div class="demo">
    <div class="container">
        <div class="row">
            <div class="col-md-6">
                <div class="form-bg">
                    <form class="form-horizontal">
                        <div class="form-group">
                            <input required="" name="login[username]" type="email" class="form-control" placeholder="Username" id="exampleInputEmail1">
                        </div>
                        <div class="form-group">
                            <input required="" name="login[password]" type="password" class="form-control" placeholder="Password">
                        </div>
                        <div class="form-group">
                            <button type="submit" class="btn btn-default">login</button>
                        </div>
                        <div class="form-group">
                            <a href="#" class="forgot-pass">Forgot password?</a>
                            <a href="#" class="signup">Sign up</a>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>

.demo{ background: #e3e3e3; }
.form-bg{
    padding: 8px;
    background: #f0f4f7;
    border: 4px solid #fff;
    box-shadow: 0 0 0 3px #b3bcc1;
    position: relative;
}
.form-horizontal{
    padding: 40px 40px 0 40px;
    background: #fff;
    border: 3px solid #c0c9ce;
}
.form-bg:before,
.form-bg:after,
.form-horizontal:before,
.form-horizontal:after{
    content: "";
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #f0f4f7;
    border: 3px solid transparent;
    border-right: 3px solid #c0c9ce;
    border-bottom: 3px solid #c0c9ce;
    position: absolute;
    top: 5px;
    left: 5px;
    z-index: 2;
}
.form-bg:after{
    left: auto;
    right: 5px;
    transform: rotate(90deg);
}
.form-horizontal:before,
.form-horizontal:after{
    top: auto;
    bottom: 5px;
    transform: rotate(-90deg);
}
.form-horizontal:after{
    left: auto;
    right: 5px;
    transform: rotate(-180deg);
}
.form-horizontal .form-group{
    margin: 0 0 15px 0;
    position: relative;
}
.form-horizontal .form-group:first-child:before,
.form-horizontal .form-group:first-child:after{
    content: "";
    width: 10px;
    height: 50px;
    background: #fff;
    background-image: repeating-linear-gradient( transparent, transparent 2px, #c9cbcc 2px, #c9cbcc 4px);
    border-radius: 5px;
    border: 2px solid #aaaeb1;
    position: absolute;
    bottom: -32px;
    left: 20px;
    z-index: 1;
}
.form-horizontal .form-group:first-child:after{
    left: auto;
    right: 20px;
}
.form-horizontal .form-group:last-child{
    padding: 30px 40px;
    margin: 30px -40px 0 -40px;
    background: #fafafa;
    border: 2px solid #fff;
    border-top: 2px solid #d5dadd;
    overflow: hidden;
    z-index: 1;
}
.form-horizontal .form-group:last-child:before{
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    background: url("../images/img-1.png") repeat;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
}
.form-horizontal .form-control{
    height: 50px;
    background: #dbe0e4;
    border: 2px solid #b3bcc1;
    border-radius: 8px;
    box-shadow: inset 0 7px 9px -7px rgba(0,0,0,0.4);
    padding: 0 50px;
    font-size: 16px;
    font-weight: bold;
    color: #687176;
    position: relative;
    transition: all 0.3s ease 0s;
}
.form-horizontal .form-control:focus{
    box-shadow: none;
    outline: 0 none;
}
.form-horizontal .form-control::-webkit-input-placeholder{ color: #687178 !important; }
.form-horizontal .form-control:-moz-placeholder{ color: #687178 !important; }
.form-horizontal .form-control::-moz-placeholder{ color: #687178 !important; }
.form-horizontal .form-control:-ms-input-placeholder{ color: #687178 !important; }
.form-horizontal .btn,
.form-horizontal .btn:focus{
    width: 100%;
    height: 50px;
    line-height: 50px;
    padding: 0 30px;
    background: #d4ec64;
    background: linear-gradient(to top, #b8db4d, #d4ec64);
    border: 2px solid #98bf30;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    color: #728335;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: relative;
}
.form-horizontal .btn:hover{
    background: #d4ec64;
    background: linear-gradient(to top, #b8db4d, #d4ec64);
}
.form-horizontal .forgot-pass,
.form-horizontal .signup{
    display: inline-block;
    padding: 8px 15px;
    background: #eff3f6;
    border-radius: 8px;
    border: 2px solid #b3bcc1;
    font-size: 17px;
    font-weight: bold;
    color: #677077;
}
.form-horizontal .signup{
    float: right;
    background: linear-gradient(to top, #da964d, #e5b457);
    border-color: #bd8f31;
    color: #fff;
}
@media only screen and (max-width: 480px){
    .form-horizontal{ padding: 20px 20px 0; }
    .form-horizontal .form-group:last-child{
        padding: 30px 40px;
        margin: 30px -20px 0 -20px;
    }
    .form-horizontal .forgot-pass,
    .form-horizontal .signup{
        display: block;
        float: none;
        font-size: 14px;
        text-align: center;
    }
    .form-horizontal .forgot-pass{ margin-bottom: 10px; }
}

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