form {
    max-width: 200px;
    display: block;
    margin: 0 auto;
    padding: 20px;
    border: solid silver 1px;
}

form input[type="email"],
form input[type="password"],
form input[type="submit"] {
    border: solid silver 1px;
    display: block;
    margin: 0 -1px;
    width: 100%;
}

form input[type="submit"] {
    padding: 8px 0;
    cursor: pointer;
}

form input[type="submit"]:hover {
    background: #F4F4F4;
}