body {
    margin: 0px;
    padding: 0px;
    line-height: 2.0;
    font-family: sans-serif;
    font-size: 18px;
}

h1 {
    text-align: center;
    background-color: rgb(105, 105, 105);
}

form {
    width: 50%;
    margin: 50px auto;
    /* centraliza horizontalmente e adiciona margem superior */
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: #f9f9f9;
}

button {
    border-bottom: 300px;
    border-style: none;
    width: 400px;
    border-radius: 300px;
}

a {
    color: black;
    font-family: Georgia, 'Times New Roman', Times, serif;
}