body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #efeeee;
    color: #0088cc;
}

.container {
    margin: auto;
    padding: 20px;
    width: 50%;
    
}

h1 {
    text-align: center;
    font-size: 2em;
    margin-bottom: 20px;
}

.periodo {
    border: 1px solid #ccc;
    padding: 10px;
    margin-bottom: 10px;
    cursor: pointer;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.periodo:hover {
    background-color: #f9f9f9;
}

h2 {
    margin: 0;
    font-size: 1.5em;
}

.anios-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding-top: 10px;
}

.anio {
    flex: 1;
    min-width: 200px;
}

h3 {
    margin: 0 0 10px 0;
    font-size: 1.2em;
    color: #0056b3;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    margin-bottom: 5px;
}

a {
    text-decoration: none;
    color: #0088cc;
}

a:hover {
    text-decoration: underline;
}

@media (max-width: 600px) {
    .anios-container {
        flex-direction: column;
    }
}