change transparency of text javascript html code example

Example 1: background color with opacity

h1 {background-color:rgba(255,0,0,0.3);}

Example 2: container transparent text opaque

.mycontainer {
    background: rgb(60, 60, 60);
    background: rgba(60, 60, 60, 0.4);
}

.mycontainer a {
    color: #fff;
}