Custom stylesheet not working?

I have added some code the my custom style sheet, but it doesn’t seem to make a difference.

The page I am altering is this https://hooptricks.org/start-here

My code is in the main stylesheet and looks like this

.lcp_thumbnail{
float: left;
padding: 10px;
}
.lcp_catlist ul {
clear:left;
padding: 0px;
margin: 0px;
list-style: none;
}
.lcp_catlist li {
display: inline;
}

.lcp_title{
display: none;
}

It works when it is in the main stylesheet, but when I add it to the custom stylesheet, it doesn’t seem to take any affect.

Ideas on what going on?