.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Semi-transparent black background */
    display: none; /* Initially hidden */
    z-index: 9999; /* Set a high z-index to make sure it's above other content */
}

/* Style the date input */
input[type="date"] {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
}

/* Style the month input */
#month {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
}

/* Style the "Add Bill" and "Remove Last Bill" buttons */
.btn-success,
.btn-danger {
    margin-right: 10px;
}

/* Custom CSS to change the focus and active colors to black */
.form-control:focus,
.form-control:active {
    border-color: #000 !important; /* Black border color on focus and active states */
    box-shadow: none !important; /* Remove the default box-shadow */
}


/* Custom CSS to increase the width of the navbar */
.navbar-nav .nav-link {
    font-size: 18px; /* Adjust the font size as needed */
    }
.navbar-nav .nav-link.no-hover:hover {
    color: #fff !important; /* Use the default text color on hover */
    text-decoration: none !important; /* Remove the underline on hover */
}
.navbar-nav .nav-link:hover {
    color: #F0E68C !important; /* Red color on hover with !important */
    text-decoration: underline; /* Underline the text on hover */
    text-underline-offset: 4px; /* Adjust the space between text and underline */
}
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 10px;
    height: 60px; /* Adjust the height as needed */
    margin: 0 auto; /* Center the navbar horizontally */
}
    /* Add CSS to make the table header fixed */
    table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 20px; /* Adjust this value as needed */
    }
    th, td {
        padding: 8px;
        text-align: center;
    }
    th {
        position: sticky;
        top: 40px; /* Height of the navbar + margin-top */
        background-color: #f2f2f2;
    }
    thead th {
        position: -webkit-sticky; /* For Safari */
        z-index: 2;
    }
    th.hidden,
    td.hidden {
        display: none;
    }
    thead th {
    background-color:#808080; /* Change this color to your desired background color */
    color: #fff; /* Change this color to your desired text color */
    padding: 8px;
    text-align: center;
}