body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 2rem;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid #ddd;
}

header h1 {
    margin: 0;
    font-size: 2rem;
    color: #005a9c;
}

.problem-description {
    padding: 1rem 0;
}

.graphic {
    text-align: center;
    padding: 1rem 0;
}

.graphic img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    padding: 1rem;
}

.simulation-container {
    text-align: center;
    padding: 1rem 0;
}

#fluid-canvas {
    background-color: #000;
    border: 1px solid #ddd;
}

.controls {
    text-align: center;
    padding: 1rem 0;
}

.button, button {
    display: inline-block;
    background: #005a9c;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.button:hover, button:hover {
    background: #003c6a;
}