The device width is less than 640px (for example, a mobile phone) automatically set the borderless box, the width is less than 500px button automatically rotates. Optional transparent background.
<SignaturePad OnResult="((e) => { Result=e; ShowSignaturePad = (Result==null); })" EnableChangeColorBtn="false" Responsive="true" BackgroundColor="rgba(0,0,0,0)" SignAboveLabel="" OnClose="() => ShowSignaturePad =false" />