#gc_clearcache {
    position: fixed;
    right: 5px;
    bottom: 5px;
    width: 30px;
    height: 30px;
    border-radius: 15px;
    padding: 0;
    margin: 0;
    font-size: 20px;
    line-height: 25px;
}

#gc_clearcache i {
    font-size: 20px;
    line-height: 20px;
}

#gc_clearcache:hover {
    width: 50px;
    height: 50px;
    border-radius: 25px;
    font-size: 30px;
    line-height: 45px;
}

#gc_clearcache:hover i {
    font-size: 30px;
    line-height: 30px;
}