body {
    text-align: center;
}

.card {
    display: inline-block;
    margin: 20px;
    border: 1px solid #ccc;
    border-radius: 6px;
    max-width: 400px;
    width: 100%;
}

.card-header {
    background-color: #28a745;
    color: #fff;
    padding: 10px;
}

.card-body {
    background-color: #fff;
    color: black;
    padding: 10px;
}

.card-footer {
    background-color: #dc3545;
    color: #fff;
    padding: 10px;
}

.btn {
    display: inline-block;
    padding: 6px 12px;
    margin-bottom: 0;
    font-size: 14px;
    font-weight: normal;
    line-height: 1.42857143;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 4px;
    text-decoration: none;
}

.btn-dark {
    color: #fff;
    background-color: #343a40;
    border-color: #343a40;
}

.btn-dark:hover {
    background-color: #23272b;
    border-color: #1d2124;
}

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

.btn-success:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

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

.btn-danger:hover {
    background-color: #c82333;
    border-color: #bd2130;
}

.h1 {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 0;
}