if a container has an opacity, how do you make the child element not have an opacity bootstrap code example

Example: affect top div opacity without affecting childrne

#container {
    border: solid gold 1px;   
    width: 400px;
    height: 200px;
    background:rgba(56,255,255,0.1);
}

#box {
    border: solid silver 1px;
    margin: 10px;
    width: 300px;
    height: 100px;
    background:rgba(205,206,255,0.1);
  	transition: 2s background;
}

// if you then want to apply an animation, do it on background-color instead of opacity

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