body {
    background-color: #f8f9fa;
}

.container {
    max-width: 400px;
    margin: 0 auto;
    padding-top: 2%;
}

.portfolio-navigator {
    display: block;
    margin: 0 auto 20px;
    max-width: 100%;
    height: auto;
}

.form-signin {
    background-color: #fff;
    padding: 15px;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.form-signin .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
    margin-bottom: 15px;
}

.form-signin .btn {
    font-size: 16px;
    font-weight: bold;
    background-color: #267ea0;
    border-color: #267ea0;
    color: #fff;
}

.alert {
    margin-bottom: 20px;
}

.form-control:focus {
    box-shadow: 0 0 0 0.1rem rgb(38, 126, 160);
    border-color: #267ea0;
}