.ach-codebox {
    position: relative;
    margin: 30px 0;
    background: #2d2d2d; /* dark background */
    border-radius: 6px;
    overflow: auto;
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
    font-size: 14px;
    line-height: 1.5;
    font-family: Consolas, Monaco, 'Courier New', monospace;
}

.ach-codebox pre {
    margin: 0;
    padding: 18px;
    white-space: pre;
}

.ach-copy {
    position: absolute;
    top: 12px;
    right: 12px;
    background: #444;
    color: #fff;
    font-size: 12px;
    padding: 5px 10px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    opacity: 0.8;
}
.ach-copy:hover {
    background: #666;
    opacity: 1;
}