/* 代码块一键复制按钮 */
figure.highlight {
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    padding: 2px 8px;
    font-size: 12px;
    line-height: 1.6;
    color: #cccccc;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 4px;
    cursor: pointer;
    opacity: 0.45;
    transition: opacity 0.2s;
}

figure.highlight:hover .copy-code-btn,
.copy-code-btn:focus {
    opacity: 1;
}

.copy-code-btn.copied {
    color: #99cc99;
    border-color: #99cc99;
}