fallback.html

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    <title>غير متصل بالأنترنات</title>
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      body { background: #ECEFF1; color: rgba(0,0,0,0.87); font-family: Roboto, Helvetica, Arial, sans-serif; margin: 0; padding: 0; }
      #message { background: white; max-width: 360px; margin: 100px auto 16px; padding: 32px 24px 16px; border-radius: 3px; }
      #message h3 { color: #888; font-weight: normal; font-size: 16px; margin: 16px 0 12px; }
      #message h2 { color: #1a964a; font-weight: bold; font-size: 16px; margin: 0 0 8px; }
      #message h1 { font-size: 22px; font-weight: 300; color: rgba(0,0,0,0.6); margin: 0 0 16px; text-align: center}
      #message p { line-height: 140%; margin: 16px 0 24px; font-size: 14px; text-align: center}
      #message a { display: block; text-align: center; background: #039be5; text-transform: uppercase; text-decoration: none; color: white; padding: 16px; border-radius: 4px; }
      #message, #message a { box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); }
      #load { color: rgba(0,0,0,0.4); text-align: center; font-size: 13px; }
      @media (max-width: 600px) {
        body, #message { margin-top: 0; background: white; box-shadow: none;text-align: center; }
        body { border-top: 16px solid #3f3d3a; }
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    <div id="message" style="align-items: center;">
        <h1>غير متصل بالأنترنات</h1>
        <p>.لا يمكنك مشاهدة الصفحة الحالية دون أنترنات</p>
        <a href="/index.html">العودة للصفحة الرئيسية</a>
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