styles.css

body {
    font-family: 'Arial', sans-serif;
    background-color: #121212; 
}

.container {
    background-color: #1E1E1E;
    padding: 20px;
    border-radius: 8px;
}

.form-control {
    background-color: #242424;
    color: #B0B0B0;            
    border: 1px solid #444;
}

.form-control:focus {
    border-color: #555;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
}

select.form-control option {
    background-color: #242424;
    color: #B0B0B0;
}

select.form-control {
    background-color: #242424;  
    color: #B0B0B0;             
    border: 1px solid #444;
    appearance: none;           /* Disable default browser styling */
    -webkit-appearance: none;   /* Safari */
    -moz-appearance: none;      /* Firefox */
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23B0B0B0" d="M2 0L0 2h4L2 0zm0 5L0 3h4l-2 2z"/></svg>');  /* Custom arrow icon */
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 16px;
}

select.form-control:focus,
input[type="text"].form-control:focus,
input[type="number"].form-control:focus {
    border-color: #555;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
}

select.form-control:focus::-ms-value {
    background-color: #242424;
    color: #B0B0B0;
}

select.form-control:-moz-focusring {
    color: #B0B0B0;
    text-shadow: 0 0 0 #B0B0B0;
}

select.form-control:focus {
    color: #B0B0B0;
}

select.form-control > option {
    background-color: #242424;
    color: #B0B0B0;
}

select.form-control > option:checked {
    background-color: #323232;  
    color: #B0B0B0;
}

/* Fix for dropdown background color on open in some browsers */
select.form-control[size], select.form-control[multiple] {
    background-color: #242424;
}

/* For browsers that support the ::-ms-expand pseudo-element (e.g., IE and Edge) */
select.form-control::-ms-expand {
    background-color: #242424;
    color: #B0B0B0;
}

textarea#output {
    background-color: #242424;  
    color: #B0B0B0;             
    border: 1px solid #444;
}

textarea#output:focus {
    border-color: #555;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover, .btn-primary:active {
    background-color: #0056b3;
    border-color: #0056b3;
}

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

/* For Chrome and other WebKit browsers */
@media screen and (-webkit-min-device-pixel-ratio:0) {
    select.form-control:focus,
    select.form-control:active {
        background-color: #242424 !important;
    }
}

input[type="text"].form-control,
input[type="number"].form-control {
    background-color: #242424;
    color: #B0B0B0;
    border: 1px solid #444;
}

input[type="text"].form-control:focus,
input[type="number"].form-control:focus {
    border-color: #555;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
    background-color: #242424; 
    color: #B0B0B0;
    outline: none;
}

/* Override browser-specific styles for input[type="number"] */
/* For Firefox */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* For Chrome */
input[type="number"]::-webkit-clear-button {
    display: none;  /* Removes the clear button in Webkit browsers */
}

.popup {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    background-color: #444;
    color: white;
    border-radius: 5px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    z-index: 1000;
}