html - How would I make background of slideshow more opaque -

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this question has answer here:

i kinda want make black background little transparent unfortunately making image within slide transparent well.

code:

#slideshow {     float:left;     width: 810px;     height: 360px;     margin: 10px 0 0 10px;       background-color: rgb(0,0,0);     -webkit-border-radius: 6px;      -moz-border-radius: 6px;     border-radius: 6px; }  #slideshow img {     margin: 5px 5px;     -webkit-border-radius: 6px;     -moz-border-radius: 6px;     border-radius: 6px; }

you can use rgba() set background color opacity.

example:

#div {    background-color: rgba(0,0,0,.4); }

this make background black 40% opacity.


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