Testen ob alle Datein ausgefüllt sind

Es wird vor dem Absenden geschaut ob alle Felder ausgefüllt sind

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Dann hier klicken

Der hier verwendete Code

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<!DOCTYPE html>
<html lang="de">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Instagram 2.0</title>
    <style>
:root{
   --bright: #e0c2a5;
   --brown: #684536;
   --background: #fffee9;
   --cream: #f3ecc5;
}
@font-face {
   font-family: Open Sans;
   src: url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@300&display=swap");
}  
*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}
body{
  display:flex;
  flex-direction:column;
  background:var(--background);
}
header {
  display:flex;
  flex-direction:row;
  justify-content:flex-start;
  margin-left:50px;
  padding: 30px 0;
}
header h1 {
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX