body {
    font-family: "Times New Roman", Times, serif;
    background-color: #c0c0c0;
    color: #000000;
    margin: 20px;
}

a {
    color: #0000ff;
    text-decoration: underline;
}

a:visited {
    color: #800080;
}

.main-container {
    width: 800px;
    margin: 0 auto;
    background-color: #c0c0c0;
    border: 2px solid #000000;
    padding: 20px;
}

.main-header {
    text-align: center;
    border-bottom: 2px solid #000000;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

h1 {
    font-size: 36px;
    font-weight: bold;
}

nav a {
    margin: 0 10px;
}

.flash-message {
    border: 1px solid #000000;
    background-color: #ffffcc;
    padding: 10px;
    margin-bottom: 15px;
}

footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 10px;
    border-top: 2px solid #000000;
    font-size: 12px;
}

/* Form styles */
form {
    border: 2px outset #c0c0c0;
    padding: 20px;
    background-color: #c0c0c0;
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 5px;
    border: 1px solid #000000;
    background-color: #ffffff;
}

input[type="submit"],
.btn {
    background-color: #c0c0c0;
    border: 2px outset #c0c0c0;
    padding: 5px 15px;
    font-weight: bold;
    cursor: pointer;
}

input[type="submit"]:active,
.btn:active {
    border-style: inset;
}

/* Card-like containers */
.card {
    border: 2px outset #c0c0c0;
    padding: 15px;
    margin-bottom: 20px;
    background-color: #c0c0c0;
}