My wordpress theme dont show my new styles

Hey my english is not good,but i have an strange problem, when i try to put some css in my custom.css like this dont work. My theme is wootube,

—-view—–

div class=”adsense_one”> lalala </div>

—-css——-

.adsense_one{
margin-left: 24px !important;
}
Thanks a lot!