.fs-container {
    max-width: 700px;
    margin: 2em auto;
    padding: 1.5em;
    border: 2px solid #ddd;
    border-radius: 12px;
    background: #fffefc;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    font-family: Arial, sans-serif;
}

.fs-container label {
    font-weight: bold;
    display: block;
    margin: 1em 0 0.2em;
}

#fs-input {
    width: 100%;
    padding: 10px;
    font-size: 1.1em;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.fs-controls {
    margin-top: 1em;
}

.fs-controls input[type=range] {
    width: 100%;
}

#fs-preview {
    margin-top: 1.5em;
    padding: 20px;
    border: 1px dashed #aaa;
    background-color: #f9f9f9;
    border-radius: 6px;
    min-height: 100px;
    font-size: 32px;
    line-height: 1.5;
    transition: all 0.2s ease-in-out;
}