* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    display: flex;
    flex-direction: column;
    height: 100vh;
    text-align: center; 
}

header {
    background: #343a40;
    color: white; 
    text-align: center; 
    padding: 15px;
}

footer {
    background: #343a40; 
    color: white; 
    text-align: center; 
    padding: 15px;
}


header {
    background: #5b6064;
    color: white;
    text-align: center;
    padding: 15px;
}

nav {
    background-color: #007bff;
    color: #fff;
    padding: 15px;
    border-radius: 5px;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

.table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    border-radius: 5px;
    overflow: hidden;
}

.table th, .table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

.table th {
    background-color: #007bff;
    color: #fff;
}

.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-success {
    background-color: #28a745;
    color: white;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}