body {
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    margin: 0;
}

.box {
    max-width: 380px;
    margin: 80px auto;
    background: #fff;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .08);
}

h1 {
    margin-top: 0;
    font-size: 24px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 8px 0 14px 0;
    box-sizing: border-box;
    border: 1px solid #d0d7e2;
    border-radius: 8px;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #1f6feb;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
}

.error {
    color: #c62828;
    margin-bottom: 12px;
}