body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    /* background-image: url("https://tse1.mm.bing.net/th?id=OIP.vG2XLs0w2u2mKDXFcWnlRwHaEK&pid=Api&P=0&h=220");
    background-size: cover;
    background-repeat: no-repeat; */
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 15px;
    text-align: center;
}

nav {
    margin: 10px 0;
    text-align: center;
}

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

nav ul li {
    display: inline;
    margin-right: 10px;
}

nav ul li a {
    text-decoration: none;
    color: #4CAF50;
}

main {
    padding: 20px;
}

form {
    margin-bottom: 20px;
}

form label {
    display: block;
    margin-bottom: 5px;
}

form input, form textarea, form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
}

form button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 8px;
    text-align: left;
}

th {
    background-color: #4CAF50;
    color: white;
}