body{margin:0;font-family:Arial;background:#f4f6f8}
header{background:#fff;padding:15px;text-align:center;box-shadow:0 0 5px #ccc}
header button{padding:10px 25px;margin:5px;background:#1e88e5;color:#fff;border:none;border-radius:5px;cursor:pointer}
.container{width:80%;margin:30px auto;background:#fff;padding:20px;text-align:center}
.banner{width:60%;margin:20px auto}
input{width:60%;padding:10px;margin:10px}
.btn{background:#00bcd4;color:#fff;padding:10px 30px;border:none;border-radius:20px}