#invoice-app { background: #fff; color: #000; padding: 20px; max-width: 800px; margin: 0 auto; border-radius: 10px; }
#invoice-app input, #invoice-app select, #invoice-app textarea { width: 100%; padding: 10px; margin-bottom: 10px; }
#invoice-app .item { display: flex; gap: 10px; align-items: center; }
#invoice-app .remove-item { background: none; border: none; color: red; cursor: pointer; font-size: 18px; }
button#generate-pdf {
    background-color: #000;
    color: #fff;
    padding: 10px 25px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
#button#generate-pdf:hover {
  background-color: #f3c32c; /* yellow hover color */
  color: #000;
}

#button#generate-pdf::after {
  content: "\1F4C4"; /* 📄 icon */
  font-size: 18px;
}

button {
    background-color: #000;
    color: #fff;
    padding: 10px 25px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
button#add-item {
    color: #fff;
    margin-bottom: 10px;
    border-radius: 5px;
}
#invoice-app {
  background: linear-gradient(to right, #f9f9f9, #ffffff);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}