body {
    font-family: sans-serif;
    padding: 2rem;
    background: #f8f8f8;
}
main {
    max-width: 600px;
    margin: auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input, button {
    display: block;
    width: 100%;
    margin-top: 1rem;
    padding: 0.5rem;
}
.style-btn {
    width: 48%;
    display: inline-block;
    margin: 0.5rem 1%;
}