body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

header {
    background-color: rgb(155, 76, 155);
    width: 100%;
    padding: 20px;
    display: flex;
    justify-content: flex-start;
}

.back-button {
    font-size: 40px;
    cursor: pointer;
    text-decoration: none;
    color: black;
    padding-left: 100px;
}

.welcome-section {
    text-align: center;
    margin: 50px 0;
}

.welcome-section h1 {
    font-size: 36px;
}

.welcome-section p {
    font-size: 18px;
}

.topic-container {
    width: 80%;
    max-width: 800px;
    margin: 20px 0;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.topic-container h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.topic-container p {
    font-size: 16px;
    margin-bottom: 15px;
}

.topic-container .button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.topic-container .button:hover {
    background-color: #45a049;
}

footer {
    margin-top: 50px;
    text-align: center;
    padding: 10px;
    width: 100%;
    background-color: #f1f1f1;
}

/* Shine */
@keyframes shine {
    0% {
        background-position: -200px;
    }
    100% {
        background-position: 200px;
    }
}

@keyframes grow {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.shine {
    position: relative;
    overflow: hidden;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 25%,
        rgba(255, 255, 255, 0.3) 50%,
        rgba(255, 255, 255, 0.1) 75%
    );
    background-size: 200px 100%;
    animation: shine 1.5s ease-in-out, grow 1s ease-in-out;
    animation-fill-mode: forwards;
    border-radius: 8px;
    transition: transform 0.3s ease-in-out;
}

/* Grey scaled*/
.grey {
    filter: grayscale(90%);
}

.grey:hover {
    filter: grayscale(100%);
}