.footer-area {
    position: relative;
}
.footer-area .footer-holder {
    overflow: hidden;
    display: none;
}
.foot-btn {
    position: absolute;
    display: block;
    height: 32px;
    width: 32px;
    top: -32px;
    left: 50%;
    margin-left: -16px;
    background-color: transparent;
    z-index: 1;
    border: none;
    outline: none;
}
.foot-btn:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    height: 0;
    width: 0;
    border-color: transparent transparent #fff transparent;
    border-width: 16px;
    border-style: solid;
    z-index: 0;
}
.foot-btn.open {
    top: 0;
}
.foot-btn.open:before {
    border-color: #000 transparent transparent transparent;
}