buttons style : demo 45

CSS

                        .btn{
                            border-radius: 0;
                            color: #000;
                            text-transform: uppercase;
                            overflow: hidden;
                            position: relative;
                            transition: all 0.5s ease 0s;
                        }
                        .btn:before{
                            content: "";
                            display: block;
                            width: 100%;
                            height: 100%;
                            position: absolute;
                            top: 0;
                            left: -100%;
                            transition: all 0.3s ease 0s;
                        }
                        .btn.red:before{
                            border: 0px solid #fe6d6d;
                        }
                        .btn.blue:before{
                            border: 0px solid #5bbbf5;
                        }
                        .btn.orange:before{
                            border: 0px solid #ee955b;
                        }
                        .btn.green:before{
                            border: 0px solid #79d799;
                        }
                        .btn:hover:before{
                            left: 0;
                            border-width: 3px;
                        }
                        @media only  screen and (max-width: 767px){
                            .btn{ margin-bottom: 20px; }
                        }
                    
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