buttons style : demo 64

CSS

                        .btn{
                            text-transform: uppercase;
                            border-radius: 0;
                            letter-spacing: 1px;
                            color: #fff;
                            border: none;
                            position: relative;
                        }
                        .btn:hover{ color: #fff; }
                        .btn:before,
                        .btn:after{
                            content: "";
                            position: absolute;
                            top: 0;
                            left: 0;
                            bottom: 0;
                            right: 0;
                            transition: all 0.5s ease 0s;
                        }
                        .btn:hover:before{
                            background: rgba(255, 255, 255, 0.7);
                            left: 60%;
                            right: 60%;
                        }
                        .btn:hover:after{
                            background: rgba(255, 255, 255, 0.7);
                            top: 60%;
                            bottom: 60%;
                        }
                        .btn.red{ background: #fe6d6d; }
                        .btn.blue{ background: #3cb4e5; }
                        .btn.orange{ background: #ee955b; }
                        .btn.green{ background: #79d799; }
                        @media only screen and (max-width: 767px){
                            .btn{ margin-bottom: 20px; }
                        }
                    
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