buttons style : demo 36

CSS

                        .btn{
                            border-radius: 0;
                            border: none;
                            color: #fff;
                            text-transform: uppercase;
                            position: relative;
                            transform-style: preserve-3d;
                            transition: all 0.3s ease 0s;
                        }
                        .btn:hover{
                            color: #fff;
                        }
                        .btn:before{
                            content: "";
                            position: absolute;
                            top: 0;
                            left: 0;
                            bottom: 0;
                            right: 0;
                            transform: scaleY(0);
                            transform-origin: 50% 0 0;
                            transition-duration: 0.5s;
                            z-index: -1;
                        }
                        .btn:hover:before{
                            transform: scaleY(1);
                            transition-timing-function: cubic-bezier(0.52, 1.64, 0.37, 0.56);
                        }
                        .btn.blue{
                            background: #5bc2d5;
                        }
                        .btn.blue:before{
                            background: #a2dfe3;
                        }
                        .btn.red{
                            background: #ff3939;
                        }
                        .btn.red:before{
                            background: #f97b7b;
                        }
                        .btn.green{
                            background: #35c568;
                        }
                        .btn.green:before{
                            background: #7fda9f;
                        }
                        .btn.orange{
                            background: #f88030;
                        }
                        .btn.orange:before{
                            background: #f8b284;
                        }
                        @media screen and (max-width: 767px){
                            .btn{  margin-bottom: 15px; }
                        }
                    
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