Try one of this set of css .. they are working for me.
HTML Code:
ul.a li {list-style: circle !important; list-style: }
ul.b li {list-style: disc !important;}
ul.c li {list-style: square !important;}
ol.d li {list-style: armenian !important;}
ol.e li {list-style: cjk-ideographic !important;}
ol.f li {list-style: decimal !important;}
ol.g li {list-style: decimal-leading-zero !important;}
ol.h li {list-style: georgian !important;}
ol.i li {list-style: hebrew !important;}
ol.j li {list-style: hiragana !important;}
ol.k li {list-style: hiragana-iroha !important;}
ol.l li {list-style: katakana !important;}
ol.m li {list-style: katakana-iroha !important;}
ol.n li {list-style: lower-alpha !important;}
ol.o li {list-style: lower-greek !important;}
ol.p li {list-style: lower-latin !important;}
ol.q li {list-style: lower-roman !important;}
ol.r li {list-style: upper-alpha !important;}
ol.s li {list-style: upper-latin !important;}
ol.t li {list-style: upper-roman !important;}
ol.u li {list-style: none !important;}
ol.v li {list-style: inherit !important;}
ul.a li {list-style-type: circle !important;}
ul.b li {list-style-type: disc !important;}
ul.c li {list-style-type: square !important;}
HTML Code:
ol.d li {list-style-type: armenian !important;}
ol.e li {list-style-type: cjk-ideographic !important;}
ol.f li {list-style-type: decimal !important;}
ol.g li {list-style-type: decimal-leading-zero !important;}
ol.h li {list-style-type: georgian !important;}
ol.i li {list-style-type: hebrew !important;}
ol.j li {list-style-type: hiragana !important;}
ol.k li {list-style-type: hiragana-iroha !important;}
ol.l li {list-style-type: katakana !important;}
ol.m li {list-style-type: katakana-iroha !important;}
ol.n li {list-style-type: lower-alpha !important;}
ol.o li {list-style-type: lower-greek !important;}
ol.p li {list-style-type: lower-latin !important;}
ol.q li {list-style-type: lower-roman !important;}
ol.r li {list-style-type: upper-alpha !important;}
ol.s li {list-style-type: upper-latin !important;}
ol.t li {list-style-type: upper-roman !important;}
ol.u li {list-style-type: none !important;}
ol.v li {list-style-type: inherit !important;}