.copy-code {
    display: none;
    position: absolute;
    top: 4px;
    right: 4px;
    color: rgba(255, 255, 255, 0.8);
    background: rgba(78, 78, 78, 0.8);
    border-radius: var(--radius);
    padding: 0 5px;
    font-size: 14px;
}

div.highlight:hover .copy-code,
pre:hover .copy-code {
    display: block;
}