button#hb-close {
    display: inline-block;
    padding: 0;
    border: 0;
    overflow: visible;
    font: inherit;
    background: 0;
    color: inherit;
    font-size: 100%;
    font-family: inherit;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-appearance: none
}

button#hb-close::-moz-focus-inner {
    border: 0;
    padding: 0
}