body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
.container {
    max-width: 600px;
    margin: auto;
}
h2 {
    font-size: 30px;
}
input, button {
    padding: 10px;
    margin: 5px 0;
    width: 100%;
    box-sizing: border-box;
}
button:active {
    opacity: 0.6; 
}
#output {
    margin-top: 20px;
    white-space: pre-wrap; 
}
footer {
    margin: 0px auto;
    margin-top: 20px;
    text-align: center;
    padding: 10px 0;
    background-color: #f0f0f0;
    position: sticky;
    bottom: 0;
    max-width: 600px;
}