body {
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
    margin: 0;
    padding: 0;
    color: #333;
}
header {
    background-color: #c5050c;
    color: white;
    padding: 1em;
    text-align: center;
}
main {
    padding: 2em;
    max-width: 800px;
    margin: auto;
}
footer {
    background-color: #ececec;
    text-align: center;
    padding: 1em;
    font-size: 0.9em;
    margin-top: 2em;
}
a.button {
    display: inline-block;
    padding: 0.75em 1.5em;
    background-color: #c5050c;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
}
a.button:hover {
    background-color: #a40303;
}
.green { color: green; }
.yellow { color: orange; }
.gray { color: gray; }