CopyCodeButton.css

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#CopyCodeButton {
    z-index: 0;
    opacity: 1;
    float: right;
    padding: 7px;
    color: var(--wds-secondary-button-label-color);
    cursor: pointer;
    font-weight: bold;
    position: relative;
    border-radius: 5px;
    border: 2px solid;
    border-color: var(--wds-secondary-button-label-color);
    transition-duration: 0.15s;
}
#CopyCodeButtonHover {
    top: 0;
    left: 0;
    opacity: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    position: absolute;
    transition: opacity 200ms linear;
    background-image: linear-gradient(to top, rgba(76, 86, 106, 0.3) 0%, transparent 100%);
}
#CopyCodeButton:hover #CopyCodeButtonHover {
    opacity: 1;
}
#CopyCodeButton:active {
    box-shadow: 0 0 6px;
}
#CopyCodeButton::selection {
    background: #BEC4D1;
}