buttons style : demo 217

                        

                            

                                

                                    
                                        button
                                    
                                
                            
                        
                    

                    :root{
                        --white:#fff;
                        --c: #229091; 
                        --_g: linear-gradient(#229091 0 0) no-repeat;
                    }
                    .btn{
                        color: #555;
                        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%);
                        font-family: 'Montserrat Alternates', sans-serif;
                        font-size: 18px;
                        font-weight: 700;
                        text-transform: capitalize;
                        letter-spacing: 1px;
                        padding: 8px 15px;
                        border-radius: 0;
                        border: none;
                        box-shadow: 0 0 0 .1em inset var(--c);
                        position: relative;
                        z-index: 1;
                        transition: background-size 0.4s, background-position 0s 0.4s;
                    }
                    .btn:hover{
                        --_p: 100%;
                        color: var(--white); 
                        transition: background-position 0.4s, background-size 0s;
                    }
                    @media only screen and (max-width: 767px){
                        .btn{ margin-bottom: 30px; }
                    }