Tạo button bằng CSS với hiệu ứng hover tuyệt đẹp cho Blogspot

Chèn CSS

button{background:#55579e;border:none;position:relative;transition:800ms ease all;outline:none;font:500 16px "Roboto",sans-serif;text-transform:uppercase}
button a{color:#fff!important;padding:.5em 3em;display:block}
button:hover a{color:#55579e!important;text-decoration:none!important}
button:hover{background:transparent}
button:before,button:after{content:'';position:absolute;top:0;right:0;height:2px;width:0;background:#55579e;transition:900ms ease all}
button:after{right:inherit;top:inherit;left:0;bottom:0}
button:hover:before,button:hover:after{width:100%;transition:800ms ease all}

Cách sử dụng

<button><a href="https://www.bacsiwindows.com/" target"blank">BÁC SĨ WINDOWS</a></button>

Result