.btn{padding:8px 20px;border-radius:0;overflow:hidden}.btn::before{position:absolute;content:"";top:0;left:0;width:100%;height:100%;background:linear-gradient(120deg,transparent,var(--primary-color),transparent);transform:translateX(-100%);transition:.6s}.btn:hover{background:0 0;box-shadow:0 0 20px 10px rgba(51,152,219,.5)}.btn:hover::before{transform:translateX(100%)}