body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
}

.calendar {
    display: grid;
    position: relative;
    top: 1.5em;
    grid-template-columns: repeat(7, 1fr);
    gap: 10px;
    max-width: 600px;
    margin: auto;
}

.day {
    position: relative;
    border: 1px solid #ccc;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.day:hover {
    background-color: #333;
}

.expander {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    z-index: 1000;
}

.day.active .expander {
    display: block;
}

.expander-content {
    padding: 5px;
    background-color: #333;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    font-size: 0.8em;
    min-width: 150px;
}