buttons style : demo 142

HTML

(Icon Fonts Used : Fontawesome & CSS Framwork: Bootstrap)

CSS

(Fonts required: Raleway.)
                    .btn{
                        color: #30b662;
                        background-color: transparent;
                        font-family: 'Raleway', sans-serif;
                        font-size: 18px;
                        font-weight: 600;
                        letter-spacing: 0.5px;
                        text-transform: capitalize;
                        padding: 6px 32px 6px;
                        border: 4px solid #999;
                        border-radius: 0;
                        overflow: hidden;
                        position: relative;
                        z-index: 1;
                        transition: all 0.5s ease 0.2s;
                        clip-path: polygon(20% 0%, 80% 0%, 100% 20%, 100% 80%, 80% 100%, 20% 100%, 0% 80%, 0% 20%);
                    }
                    .btn:focus,
                    .btn:hover{
                        color: #fff;
                        background-color: #30b662;
                        border-color: #30b662;
                    }
                    .btn:before,
                    .btn:after{
                        content: '';
                        background-color: #30b662;
                        height: 70px;
                        width: 70px;
                        transform: translateX(-50%) translateY(-50%) scale(0);
                        position: absolute; 
                        left: 50%;
                        top: 50%;
                        z-index: -1;
                        transition: all 0.5s ease-in-out 0s;
                        clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
                    }
                    .btn:after{
                        opacity: 0;
                        transform: translateX(-50%) translateY(-50%) scale(1);
                    }
                    .btn:focus:before,
                    .btn:hover:before{
                        opacity: 0;
                        transform: translateX(-50%) translateY(-50%) scale(2);
                    }
                    .btn:focus:after,
                    .btn:hover:after{
                        opacity: 1;
                        transform: translateX(-50%) translateY(-50%) scale(0);
                    }
                    @media only screen and (max-width: 767px){
                        .btn{ margin-bottom: 20px; }
                    }
                    
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