button {
    position: relative;
    border: 0;
    padding: 0;
    cursor: pointer;
    overflow: visible; /* removes extra side padding in IE */
}
button::-moz-focus-inner {
    border: none;
}
button span {
    position: relative;
    display: block;
    white-space: nowrap;
}
@media screen and (-webkit-min-device-pixel-ratio:0) {
    button span {
        margin-top: -1px;
    }
}