Код:
#join-chat-button {
     border-radius: 25px; 
     background-color:#afefbf;
}
#join-chat-button:hover {
    border-radius: 50%;
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    transform: rotate(360deg);
}

#join-chat-button, #join-chat-button2, #chat_main a, .chatTopLineWrapper > ul > li > ul > li > a, .chatTopLineWrapper ul li.chatMenuItemWithSeparator a, .justify, div.chatMessage span.chatUserFrom, .chatTabs ul, .chatTabs ul li.appTab a, .chatTopLineWrapper > ul > li > a, .chatTabs > ul > li.chatTab > a, .chatSendLinksPanel a.chatLinkSmiles, .chatSendLinksPanel .chatLinkImage, .has-user-id .chatLinkProfile, .chatSendLinksPanel a, .chatLinkGold, .chatLinkVip, .chatLinkModerate, .chatLinkMore, .chatSoundPanel a, .chatFooter .chatFooterWrapper .chatPanel .chatSendButtonPanel .chatSendButton, .chatPeople ul.chatPeopleList li, .chatPeople ul.chatPeopleList li a.chatUser {
    cursor: url(""), 
default;
}

#join-chat-button {
    -webkit-transition: all 0.5s ease;
    -moz-transition: all 0.5s ease;
    -o-transition: all 0.5s ease;
    -ms-transition: all 0.5s ease;
    transition: all 0.5s ease;
}

#join-chat-button, #join-chat-button2 {
    background: transparent url("http://forumuploads.ru/uploads/2015/01/31/11875746.gif") no-repeat scroll 0 0;
    background-position: center left;
    background-repeat: no-repeat;
    background-size: 100% 110%;
    border-radius: 25px 25px 25px 25px;
    box-shadow: 0 0 1px #fff, 0 0 2px #fff, 0 0 3px #fff, 0 0 4px #00FF00, 0 0 5px #F5DA81, 0 0 6px #F5DA81, 0 0 7px #F5DA81, 0 0 10px #F5DA81;
}