body {
    background-color: #121212;
    color: #e0e0e0;
    font-family: 'Courier New', Courier, monospace;
    padding: 30px;
}
h1 {
    color: #00e676;
}
.container{
    display: flex;
    flex-direction: column;
    gap:15px;
}
.pattern-box {
    margin-bottom: 30px;
    border: 1px solid #333;
    padding: 20px;
    border-radius: 12px;
    background-color: #1e1e1e;
}
input[type="number"] {
    background: #333;
    color: #fff;
    border: 1px solid #555;
    padding: 5px;
    border-radius: 5px;
    width: 300px;
    margin:auto;
}
button {
    margin-left: 10px;
    padding: 6px 12px;
    background-color: #00e676;
    color: black;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
pre {
    background-color: #000;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    white-space: pre-wrap;
}