.shadow__btn{padding:10px 20px;border:none;font-size:17px;color:#fff;border-radius:7px;letter-spacing:4px;font-weight:700;text-transform:uppercase;transition:.5s;transition-property:box-shadow;background:#008cff;box-shadow:0 0 25px #008cff}.shadow__btn:hover{box-shadow:0 0 5px #008cff,0 0 25px #008cff,0 0 50px #008cff,0 0 100px #008cff}