buttons style : demo 55

CSS

                        .btn{
                            color: #444;
                            text-transform: uppercase;
                            border-radius: 0;
                            overflow: hidden;
                            z-index: 1;
                            position: relative;
                            transition: all 0.3s ease-in-out 0.2s;
                        }
                        .btn:hover{ color: #fff; }
                        .btn:after{
                            content: "";
                            width: 110%;
                            height: 30px;
                            position: absolute;
                            top: 50%;
                            left: 50%;
                            z-index: -1;
                            transform: translateX(-50%) translateY(-50%) translateZ(0px) rotate(-45deg);
                            transition: all 0.5s ease 0s;
                        }
                        .btn:hover:after{
                            height: 110px;
                        }
                        .btn.red{ border: 2px solid #fe6d6d; }
                        .btn.blue{ border: 2px solid #3bb4e5; }
                        .btn.orange{ border: 2px solid #ee955b; }
                        .btn.green{ border: 2px solid #79d799; }
                        .btn.red:after{ background: #fe6d6d; }
                        .btn.blue:after{ background: #3bb4e5; }
                        .btn.orange:after{ background: #ee955b; }
                        .btn.green:after{ background: #79d799; }
                        @media only screen and (max-width: 767px){
                            .btn{ margin-bottom: 20px; }
                        }
                    
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