Bind HTML string with custom style

As already mentioned @Beyers, you have to use $sce.trustAsHtml(), to use it directly into the DOM, you could do it like this, JS/controller part:

$scope.trustAsHtml = function(string) {
    return $sce.trustAsHtml(string);
};

And in DOM/HTML part

<div data-ng-bind-html="trustAsHtml(htmlString)"></div>