body {
    background: linear-gradient(to right, #2d3135, #0d1323b8, #11141c) !important;
}
.container {
    max-width: 500px;
    margin-top: 100px;
}
.btn-danger {
    width: 100%;
}
.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}