.container {
    width: 80%;
    border: gray 1px solid;
    padding: 0 0 3% 0;
    margin-top: 10%;
}
.header {
    background-color: #555;
    color: white;
    padding: 10px;
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 1px;
}
.content {
    margin-top: 50px;
    text-align: center;
}
.btn-custom {
    width: 80%;
    max-width: 400px;
    margin: 15px auto;
    font-size: 18px;
    padding: 10px;
    color: #333;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
}