There are 4 blocks, how many green ones?

<div class="first"></div>
<div class="second"></div>
<div class="third"></div>
<div class="fourth"></div>

div{width:50px;height:50px;}
.first{background: rgba(0,255,0,1);}
.second{background: rgba(255,0,0,1);}
.third{background: rgba(0,255,0,0);}
.fourth{background: rgba(0,0,255,1);}
Explanation
There will be only one green block.
The fact is that the fourth parameter of the rgba property is responsible for transparency, on this basis the third block will be transparent.

CSS3 Colors
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