buttons style : demo 25

CSS

                        .btn{
                            text-transform: uppercase;
                            color:#fff;
                            box-shadow:none;
                            transition: all 0.40s ease;
                            -webkit-transition: all 0.40s ease;
                            -moz-transition: all 0.40s ease;
                            -ms-transition: all 0.40s ease;
                            -o-transition: all 0.40s ease;
                        }
                        .btn.blue{
                            background:#0bbff2;
                        }
                        .btn.blue:hover {
                            color: #0bbff2;
                            background: transparent;
                            box-shadow: 0 0 10px 0 #0bbff2 inset, 0 0 10px 4px #0bbff2;
                        }
                        .btn.orange{
                            background:#e67e22;
                        }
                        .btn.orange:hover{
                            color: #e67e22;
                            background: transparent;
                            box-shadow: 0 0 10px 0 #e67e22 inset, 0 0 10px 4px #e67e22;
                        }
                        .btn.purple{
                            background:#580141;
                        }
                        .btn.purple:hover{
                            color: #580141;
                            background: transparent;
                            box-shadow: 0 0 10px 0 #580141 inset, 0 0 10px 4px #580141;
                        }
                        .btn.green{
                            background:#00852f;
                        }
                        .btn.green:hover{
                            color: #00852f;
                            background: transparent;
                            box-shadow: 0 0 10px 0 #00852f inset, 0 0 10px 4px #00852f;
                        }
                        @media only screen and (max-width: 767px) {
                            .btn{ margin-bottom: 15px; }
                        }
                    
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