CSS применяет класс
<div> // div{applay style}
<div id="yourID"> //#yourID{applay style}
<div class="yourClass"> //.yourClass{applay style}
zombie 223
<div> // div{applay style}
<div id="yourID"> //#yourID{applay style}
<div class="yourClass"> //.yourClass{applay style}