Checkbox style : demo 14

                        .checkbox{ display: inline-block; }
                        .checkbox input[type=checkbox]{
                            margin: 0;
                            visibility: hidden;
                            left: 1px;
                            top: 1px;
                        }
                        .checkbox label{
                            width: 52px;
                            height: 30px;
                            border: 3px solid #555;
                            border-radius: 100px;
                            cursor: pointer;
                            display: block;
                            overflow: hidden;
                            position: relative;
                            transition: all 0.75s ease;
                        }
                        .checkbox label:before,
                        .checkbox label:after{
                            content: '';
                            background: #555;
                            border-radius: 50px;
                            width: 20px;
                            height: 20px;
                            position: absolute;
                            top: 2px;
                            left: 2px;
                            opacity: 1;
                            transition: 0.75s ease;
                        }
                        .checkbox label:after{
                            left: auto;
                            right: 2px;
                            opacity: 0;
                        }
                        .checkbox input[type=checkbox]:checked+label{
                            border-color: #a30d9e;
                            box-shadow: 0 0 5px rgba(163,13,158,0.4);
                        }
                        .checkbox input[type=checkbox]:checked+label:before{ opacity: 0; }
                        .checkbox input[type=checkbox]:checked+label:after{
                            background-color: #a30d9e;
                            opacity: 1;
                        }
                        @media only screen and (max-width:767px){
                            .checkbox{ margin: 0 0 20px; }
                        }