MediaWiki:Gadget-copyTable.css

/* Wrapper shrink-wraps to the table so the button hugs its corner */
.copy-table-wrapper {
    position: relative;
    display: block;     /* was: inline-block — that shrink-wrapped the table */
    max-width: 100%;
}

/* Barely visible at rest, appears on hover */
.copy-table-btn {
    position: absolute;
    bottom: 6px;
    right: 6px;
    padding: 5px;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.7);
    color: #72777d;
    cursor: pointer;
    opacity: 0.3;
    transition: opacity 0.2s, background 0.2s, border-color 0.2s;
}
.copy-table-btn:hover {
    opacity: 1;
    background: #ffffff;
    border-color: #a2a9b1;
    color: #202122;
}

/* Green checkmark after successful copy */
.copy-table-btn--ok {
    opacity: 1;
    color: #00af89;
}