.cmp-accordion .cmp-btn-more span, .cmp-accordion .cmp-btn-close span{
    font-size: 15px!important;
    color: #00C!important;
}
.cmp-accordion .cmp-btn-more, .cmp-accordion .cmp-btn-close{
    border:none!important;
    background: url(https://voi.0101.co.jp/voi/etc/designs/voi/clientlibs/images/button/arw_close.png) no-repeat 63%;
}
.cmp-accordion .cmp-btn-close{
    background: url(https://voi.0101.co.jp/voi/etc/designs/voi/clientlibs/images/button/arw_open.png) no-repeat 63%;
}