body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(270deg, #ff7e5f, #feb47b);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 350px;
}

.result {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.result input {
    width: 70%;
    padding: 10px;
    margin-right: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

.result button {
    padding: 10px;
    cursor: pointer;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
}

.result button:hover {
    background-color: #0056b3;
}

h2 {
    margin-top: 20px;
    margin-bottom: 10px;
}

.options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.option-group {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 10px;
}

.length-group {
    margin-top: 10px;
}

button#generate {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.2s ease-in-out;
}

button#generate:hover {
    background-color: #0056b3;
    transform: scale(1.05);
}

button#generate:active {
    transform: scale(0.95);
}