.buttonitem-content {
    font-size: 1em;
    line-height: 130%;
    padding: 4px 5px 3px 4px;
    margin: 2px;
    white-space: nowrap;
    width: auto;
    overflow: visible;
}
.buttonitem-icon {
    display: inline-block;
    margin-top: -3px;
    vertical-align: middle;
}
.buttonitem-label {
    line-height: 1em;
    display: inline-block;
}
.buttonitem-label {
    padding: 0 5px;
}
.buttonitem-icon-only {
    font-size: 0;
    height: 16px;
    width: 16px;
    overflow: hidden;
    padding: 3px;
    box-sizing: content-box;
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box;
}
.buttonitem-icon-only .buttonitem-icon {
    margin-top: 0;
}
.gecko .buttonitem-icon-only .buttonitem-icon {
    margin-top: -3px;
}