Checkbox style : demo 1

                        .checkbox{
                            background: #333;
                            width: 65px;
                            height: 30px;
                            border-radius: 50px;
                            margin: 0 auto;
                            position: relative;
                        }
                        .checkbox:after{
                            content: '';
                            background: #111;
                            height: 2px;
                            width: 37px;
                            border-radius: 50px;
                            box-shadow: inset 0px 1px 1px rgba(0, 0, 0, 0.5), 0px 1px 0px rgba(255, 255, 255, 0.2);
                            position: absolute;
                            top: 14px;
                            left: 14px;
                        }
                        .checkbox label{
                            background: #111;
                            width: 22px;
                            height: 22px;
                            padding: 0;
                            border: 6px solid #fff;
                            border-radius: 50%;
                            box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.3), 0 1px 1px rgba(0, 0, 0, 1) inset;
                            cursor: pointer;
                            display: block;
                            position: absolute;
                            top: 4px;
                            left: 4px;
                            z-index: 1;
                            transition: all 0.4s ease 0s;
                        }
                        .checkbox input[type=checkbox]{
                            margin: 0;
                            visibility: hidden;
                        }
                        .checkbox input[type=checkbox]:checked+label{ left: 39px; }
                        .checkbox input[type=checkbox]:checked+label{ background: #4cd137; }
                        @media only screen and (max-width:767px){
                            .checkbox{ margin: 0 0 20px; }
                        }