如何使用十进制值设置CSS RGB颜色？

Question

I'm in new to HTML/CSS. I can see that there are various ways of setting color code in a CSS style description ie by name eg yellow or by hex code #ffff00 . I see there are also decimal equivalents of each color eg yellow has decimal equivalent as 255,255,0 but applying the below style on my body element has no effect at all:

My CSS:

body {
background-color: 255,255,0;
color: black !important;
}

Can someone help me on this?

Answer 1

Like this

body {
    background-color: rgb(255,255,0);
}

To add opacity, use rgba . Where 1 is 100% opacity.

body {
    background-color: rgba(255,255,0, 1);
}

Answer 2

rgba(255,255,0,1) To add opacity, use rgba. Where 1 is 100% opacity.

 .body { background-color: rgb(255,255,0); color: black !important; padding:25px; } 

 <div class="body"></div> 

Answer 3

you need to add this rule to your css rgb(0,0,0) or rgba(0,0,0,0.5) to opacity.

body {
    background-color: rgb(255,255,0);
    color: rgba(0,0,0,0.7);
}