MediaWiki:Gadget-HexConverter.css

div.hex-converter-live-buttons-container {
    width: 100%;
    display: flex;
    justify-content: space-between;
}

div.hex-converter-live-buttons-container button {
    flex: 1;
    margin: 0 5px 0 0;
    text-align: center;
}
button.hex-converter-active {
    border-color: #000000;
    border-radius: 4px;
    border-width: 2px;
}