.highlight {
    position: relative;
}

.code-toolbar {
    position: absolute;
    top: 0.5em;
    right: 0.5em;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.highlight:hover .code-toolbar {
    opacity: 1;
}

.copy-code-button {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 0.5em 0.8em;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.9em;
}

.copy-code-button:hover {
    background-color: #555;
}