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

.container {
    width: 80%;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-top: 30px;
}

h1 {
    text-align: center;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #333;
}

input[type="text"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

input[type="submit"],
.logout-button,
.download-button,
.add-button {
    display: block;
    width: 100%;
    padding: 10px;
    background: #5cb85c;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
}

input[type="submit"]:hover,
.logout-button:hover,
.download-button:hover,
.add-button:hover {
    background: #4cae4c;
}

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

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

th, td {
    padding: 10px;
    text-align: left;
}

th {
    background-color: #f4f4f4;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}