look cooler and show your craftiness, then you are good to go.

If you wanna add CSS to make it

/* BarcodeGenerator.css */
.THIS {
    font-family: 'Arial', sans-serif;
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
    padding: 20px;
    border-radius: 10px;
}


.THIS label {
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
    color: #333;
}


.THIS lightning-input {
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}


.THIS lightning-input:focus,
.THIS lightning-input:active{
    box-shadow: inset gray 0px 0px 60px -12px; 
    outline: none;


}


.THIS button {
    padding: 10px 15px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
 
}


.THIS button:hover {
        background-color: #3e8e41;
        color: #fff;
        font-weight: bold;
    }