[theme : Leaf] Custom css element>element selector

Hi, I’m using the Leaf theme. When I use the custom css field in the options, I can’t use the element>element selector.
When I write this :

.myClass>p{
//some css rules
}

The computed css (from the page downloaded from the server) result in :

.myClass>p{
//some css rules
}

The > (greater-than sign) is remplaced by the html code > and my custom css rules can’t be computed correctly. How can I prevent this to happen ?