buttons style : demo 236

HTML

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

CSS

(Fonts required: Signika.)
                        :root{ 
                            --color: #62327a;
                            --_g: linear-gradient(var(--color) 0 0) no-repeat;
                        }
                        .btn{
                            color: var(--color);
                            background: var(--_g) calc(var(--_p,0%) - 100%) 0%, var(--_g) calc(200% - var(--_p,0%)) 0%, var(--_g) calc(var(--_p,0%) - 100%) 100%, var(--_g) calc(200% - var(--_p,0%)) 100%;
                            background-size: 50.5% calc(var(--_p,0%)/2 + .5%);
                            outline-offset: 0.1em;
                            font-family: 'Signika', sans-serif;
                            font-size: 18px;
                            font-weight: 700;
                            text-transform: uppercase;
                            letter-spacing: 1px;
                            padding: 8px 15px;
                            border-radius: 0;
                            border: none;
                            position: relative;
                            margin: 0 10px;
                            z-index: 1;
                            box-shadow: 0 0 0 0.1em inset var(--color);
                            transition: background-size .4s, background-position 0s .4s;
                        } 
                        .btn:hover,
                        .btn:focus{ 
                            color:#fff;
                            --_p: 100%;
                            transition: background-position .4s, background-size 0s;
                        }
                        @media only screen and (max-width: 767px){
                            .btn{ margin-bottom: 30px; }
                        }
                    
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