buttons style : demo 19

CSS

                        .btn{
                            border-radius: 0;
                            text-transform: uppercase;
                            position: relative;
                            z-index: 1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn:before{
                            content: "";
                            width: 25%;
                            height:0;
                            position: absolute;
                            top: 0;
                            left:0;
                            z-index: -1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn:after{
                            content: "";
                            width: 25%;
                            height: 0;
                            position: absolute;
                            bottom: 0;
                            left: 25%;
                            z-index: -1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn span:before{
                            content: "";
                            width: 25%;
                            height:0;
                            position: absolute;
                            top: 0;
                            right: 25%;
                            z-index: -1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn span:after{
                            content: "";
                            width: 25%;
                            height:0;
                            position: absolute;
                            bottom: 0;
                            right: 0;
                            z-index: -1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn.purple{
                            border: 1px solid #580141;
                            color:#580141;
                        }
                        .btn.purple:hover:before,
                        .btn.purple:hover:after,
                        .btn.purple:hover span:before,
                        .btn.purple:hover span:after{
                            background: #580141;
                            height:100%;
                        }
                        .btn.green{
                            border: 1px solid #396b1c;
                            color:#396b1c;
                        }
                        .btn.green:hover:before,
                        .btn.green:hover:after,
                        .btn.green:hover span:before,
                        .btn.green:hover span:after{
                            background: #396b1c;
                            height:100%;
                        }
                        .btn.orange{
                            border: 1px solid #e67e22;
                            color:#e67e22;
                        }
                        .btn.orange:hover:before,
                        .btn.orange:hover:after,
                        .btn.orange:hover span:before,
                        .btn.orange:hover span:after{
                            background: #e67e22;
                            height:100%;
                        }
                        .btn.blue{
                            border: 1px solid #3498db;
                            color:#3498db;
                        }
                        .btn.blue:hover:before,
                        .btn.blue:hover:after,
                        .btn.blue:hover span:before,
                        .btn.blue:hover span:after{
                            background: #3498db;
                            height:100%;
                        }
                        .btn.purple:hover,
                        .btn.green:hover,
                        .btn.blue:hover,
                        .btn.orange:hover{
                            color:#fff;
                        }
                        @media only screen and (max-width: 767px) {
                            .btn{
                                margin-bottom: 15px;
                            }
                        }
                    
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