body {
    font-family: sans-serif;
    background: #f9f9f9;
    margin: 40px auto;
    max-width: 800px;
    line-height: 1.6;
    color: #333;
}

h1 {
    color: #111;
    font-size: 2em;
}

a {
    color: #0077cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.signal {
    background: #fff;
    border: 1px solid #ddd;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}