Larger first letters in uppercase using css3

First letter capital in css
DEMO
CSS

p:first-child::first-letter {
    font-size: 24px;
    color:#F5645C;
    font-family: sans-serif;
    background: #F5F1E9;
    padding:5px 10px;
    font-weight: bold;
    text-transform: uppercase;
}
p::first-letter {
    font-size: 24px;
    color:#7fe22a;
    font-family: sans-serif;
    text-transform: uppercase;
}