Checkbox style : demo 16

                        .checkbox{ display: inline-block; }
                        .checkbox input[type=checkbox]{
                            margin: 0;
                            visibility: hidden;
                            left: 1px;
                            top: 1px;
                        }
                        .checkbox label{
                            background: linear-gradient(to right, #fd1a15 0, #fc8b34 45%, #7fd03e 55%, #007177 100%) 0 0;
                            background-size: 650px 100%;
                            width: 57px;
                            height: 35px;
                            margin: 0;
                            border-radius: 100px;
                            box-shadow: 0 0px 10px rgba(0, 0, 0, 0.2) inset;
                            cursor: pointer;
                            overflow: hidden;
                            position: relative;
                            transition: all 500ms ease;
                        }
                        .checkbox label:before{
                            content: "Off";
                            color: #fd1a15;
                            background: #fff;
                            font-size: 13px;
                            font-weight: bold;
                            text-transform: uppercase;
                            text-align: center;
                            line-height: 28px;
                            width: 29px;
                            height: 29px;
                            border-radius: 50%;
                            position: absolute;
                            left: 3px;
                            top: 3px;
                            transition: all 150ms ease;
                        }
                        .checkbox input[type=checkbox]:checked+label{ background-position-x: -400px; }
                        .checkbox input[type=checkbox]:checked+label:before{
                            content: "On";
                            color: #007177;
                            left: 25px;
                        }
                        @media only screen and (max-width:767px){
                            .checkbox{ margin: 0 0 20px; }
                        }