Code:
HTML
<h1><span class=r>R</span>
<span class=o>A</span>
<span class=y>I</span>
<span class=g>N</span>
<span class=b>B</span>
<span class=i>O</span>
<span class=v>W</span>
</h1>
CSS
.r{color:red}.o{color:orange}
.y{color:yellow}
.g{color:green}
.b{color:blue}
.i{color:indigo}
.v{color:violet}
