body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    color: #1c1e21;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    padding: 0 10px;
}

#app {
    background-color: white;
    width: 100%;
    max-width: 600px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    box-sizing: border-box;
}

#slide, #quiz, #blog, #essay {
    text-align: center;
}

button, #go-to-essay-button {
    background-color: #1877f2;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 20px;
    border-radius: 5px;
}

button:hover, #go-to-essay-button:hover {
    background-color: #1558b0;
}

.hidden {
    display: none;
}

#options div {
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #ddd;
    cursor: pointer;
    border-radius: 5px;
}

#options div:hover {
    background-color: #f0f2f5;
}

#photo-album {
    margin-top: 20px;
    max-height: 300px;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
}

#photo-album h2 {
    font-size: 18px;
    margin-bottom: 10px;
}

.photo {
    margin: 5px;
    width: 100%;
    height: 150px;
    overflow: hidden;
    position: relative;
}

.photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

@media (max-width: 600px) {
    #app {
        padding: 10px;
    }
}