body {
    width: 50%;
    margin: 0 auto!important;
    text-align: center;
    margin-top: 1em!important;
}
#data-table {
    margin-top: 1em;
}
#incorrectURL {
    margin-top: 1em;
    display: none;
}
input#long-url {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    width: 80%;
}
button#submit-button {
    padding: 10px 20px;
    background-color: #4CAF50;
    border: none;
    color: white;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
}
button#submit-button:hover {
    background-color: #45a049;
}