buttons style : demo 124

HTML

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

CSS

(Fonts required: Noto Sans.)
                        .btn{
                            color: #fff;
                            background: #111;
                            font-family: 'Noto Sans', sans-serif;
                            font-size: 22px;
                            font-weight: 500;
                            letter-spacing: 1px;
                            text-transform: capitalize;
                            padding: 7px 18px 8px;
                            border-radius: 20px;
                            border: none;
                            overflow: hidden;
                            position: relative;
                            z-index: 1;
                            transition: all 0.3s ease 0s;
                        }
                        .btn:focus{ color: #fff; }
                        .btn:hover{
                            color: #2ecc71;
                            background: rgba(46,204,113,0.2);
                            border: none;
                            box-shadow: 0 0 10px -2px #2ecc71;
                        }
                        .btn:before,
                        .btn:after{
                            content: '';
                            height: 20%;
                            width: 100%;
                            border-radius: 20px 0 0 20px;
                            border: 4px solid #2ecc71;
                            border-right: none;
                            border-bottom: none;
                            opacity: 0;
                            position: absolute;
                            left: 0;
                            top: 0;
                            z-index: -1;
                            transition: all 0.5s ease 0s;
                        }
                        .btn:after{
                            border-radius: 0 20px 20px 0;
                            border: 4px solid #2ecc71;
                            border-top: none;
                            border-left: none;
                            top: auto;
                            bottom: 0;
                            left: auto;
                            right: 0;
                        }
                        .btn:hover:before,
                        .btn:hover:after{
                            height: 100%;
                            width: 30%;
                            opacity: 1;
                        }
                        @media only screen and (max-width: 767px){
                            .btn{ margin-bottom: 20px; }
                        }
                    
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