Adicione a seguinte meta a sua página HTML:
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="shortcut icon" type="image/png" href="/android-chrome-512x512.png">
<link rel="manifest" href="/site.webmanifest">
<meta name="theme-color" content="rgb(220,220,225)">