#urlexpander-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#urlexpander-container h3 {
    margin-top: 0;
    color: #333;
}

.urlexpander-form {
    display: flex;
    margin-bottom: 20px;
    align-items: center; /* Vertically align input and button */
}

#urlexpander-input {
    flex-grow: 1;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    margin-right: 10px; /* Add space between input and button */
}

#urlexpander-expand-btn {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
}

#urlexpander-expand-btn:hover {
    background-color: #45a049;
}

#urlexpander-result {
    background-color: white;
    padding: 15px;
    border-radius: 4px;
    display: none;
}

#urlexpander-result h4 {
    margin-top: 0;
    color: #333;
}

#expanded-url {
    word-break: break-all;
    color: #0066cc;
    font-weight: bold;
}

#additional-info {
    list-style-type: none;
    padding: 0;
}

#additional-info li {
    margin-bottom: 5px;
}

.spinner {
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 3px solid rgba(0,0,0,.3);
    border-radius: 50%;
    border-top-color: #000;
    animation: spin 1s ease-in-out infinite;
    -webkit-animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { -webkit-transform: rotate(360deg); }
}
@-webkit-keyframes spin {
    to { -webkit-transform: rotate(360deg); }
}