* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    padding: 20px;
    background-color: #f9f9f9;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.0em;
}
h2 {
    font-size: 1.0em;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

section {
    margin-bottom: 40px;
}
footer {
    text-align: center;
    margin-top: 40px;
}
label {
    display: block;
    margin-top: 10px;
}

input, textarea {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 10px;
}

button {
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

#calendar {
    margin-top: 20px;
    min-height: 400px;
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.8em;
    }

    main {
        padding: 10px;
    }
}