body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background: #35424a;
    color: #ffffff;
    padding: 10px 0;
    text-align: center;
}

h1 {
    margin: 0;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

footer {
    background: #35424a;
    color: #ffffff;
    text-align: center;
    padding: 10px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}

.upload-section {
    margin: 20px 0;
    padding: 20px;
    background: #ffffff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.upload-section h2 {
    margin-bottom: 15px;
}

.button {
    background: #35424a;
    color: #ffffff;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 5px;
}

.button:hover {
    background: #45a049;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.gallery img {
    width: 100%;
    max-width: 200px;
    border-radius: 5px;
}

.grade-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.grade-table th, .grade-table td {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}

.grade-table th {
    background-color: #35424a;
    color: white;
}