i need to hide radio input doesn't work :    This is my html code i want to hide the radio button on css but when i press f5 doesn't work 

    <div id="ud_tab">

    <input type="radio" name="ud_tabs" id="tab1" checked="">
    <label for="tab1">Headline 1</label>

    <input type="radio" name="ud_tabs" id="tab2">
    <label for="tab2">Headline 2</label>

    <input type="radio" name="ud_tabs" id="tab3">
    <label for="tab3">Headline 3</label>
    </div>

my css code is this, im new xd

    #ud_tab input[type=radio]{
    display: none;}
