body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1em;
    text-align: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2em;
}

section {
    background-color: #fff;
    padding: 1em;
    margin-bottom: 1em;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1,
h2 {
    margin-top: 0;
}

#recovery-form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#recovery-form input {
    width: 100%;
    height: 2em;
    margin-bottom: 1em;
    padding: 0.5em;
    border: 1px solid #ccc;
}

#recovery-form button {
    width: 100%;
    height: 2em;
    background-color: #333;
    color: #fff;
    border: none;
    padding: 0.5em;
    cursor: pointer;
}

#techniques-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

#techniques-list li {
    margin-bottom: 1em;
}

#rest-day-message,
#fitness-goals-message {
    font-size: 1.2em;
    font-weight: bold;
}

#recovery-chart {
    width: 100%;
    height: 200px;
}