@media (max-width: 768px) {

    main h2 {
        margin-top: 10px;
        padding-top: 20px;
    }

    nav ul {
        flex-direction: column;
        margin-bottom: 20px;
    }

    main {
        margin-top: 20px;
    }

    header img {
        width: 100%;
        height: auto;
        z-index: -1;
    }

    .index_img {
        font-size: 10px;
    }
    .fdiv {
        display: flex;
        flex-wrap: wrap;
        padding: 10px;
        margin: 10px;
    }

    
        
}


body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #121112;
    color: #e0e0e0;
}

header {
    position: relative;
    color: #fff;
    padding: 20px;
    text-align: center;
    height: 200px;
}

    header img {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: -1;
    }

    header h1 {
        width: 100%;
        height: auto;
        z-index: 1;
    }

button {
    margin: 0 0;
    height: 30px;
    width: contain;
    border-radius: 3px;
    background-color: #00ff00;
    color: #1e1e1e;
    border: 1px solid transparent;
}

    button:hover {
        color: #e0e0e0;
        border: 1px solid #00ff00;
        transition: color 0.3s;
        border-radius: 3px;
        cursor: pointer;
    }



main {
    padding: 20px;
    background: #1e1e1e;
    margin: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}


h2 {
    text-align: center;
    color: #00ff00;
    margin-bottom: 20px;
}

ul {
    list-style-type: none;
    padding: 0;
}

    ul li {
        background: #2a2a2a;
        margin: 10px 0;
        padding: 15px;
        border-radius: 5px;
        transition: background 0.3s;
    }

footer {
    text-align: center;
    padding: 10px 0;
    background: #333;
    color: #fff;
    position: relative;
    bottom: 0;
    width: 100%;
}

p {
    margin: 10px;
    text-decoration: none;
}

.phtb {
    width: 100%;
    margin-top: 20px;
    border: 1px solid #ddd;
}

.phtd {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: center;
}

th {
    background-color: #00ff00;
    color: black;
    padding: 8px;
    border: 1px solid #ddd;
}

.phtr {
    background: #333;
}





.os-ex {
    width: 100%;
}


    .os-ex td {
        padding: 30px;
        text-align: center;
        border: 1px solid white;
        background-color: #2a2a2a;
        border-radius: 10px;
    }

    .os-ex img {
        width: 100%;
        height: auto;
        border-radius: 8px;
    }

        .os-ex img:hover {
            transition: transform 0.3s;
            transform: scale(1.10);
        }

    .os-ex a {
        text-decoration: none;
    }


.index_img {
    margin: 0 0;
    color: white;
}

.footerbutton {
    background-color: lime;
    color: black;
    border: none;
    padding: 10px;
    cursor: pointer
}
.fdiv {
    display: flex;
    padding: 10px;
    background-color: #333;
    flex-wrap:wrap;
    justify-content:center;
    color: white;
}