h1 {
  color: rgb(255, 255, 255);
  font-size: 50px;
  padding-left: 25px;
}
 
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Prompt:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap" rel="stylesheet">


.container {

  background-color: black;
}

body { 
  margin: 0;
  font-family: Prompt, serif;
  background-color: #000000;
  background-attachment: fixed;
  background-size:cover;
  background-position: center center;
}
.kaikki {
  font-family: Prompt, serif;
  background-color: #222222;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  padding: 15px;
  border: double 10px gray;
 }
 
 a:link {
  text-decoration: none;
  color: rgb(255, 255, 255);
 }
 a:visited {
  color: rgb(116, 116, 116);
 }
 a:hover {
  text-decoration: underline;
 }
 a:active {
  background-color: black;
 }

 .teksti {
  font-size: 30px;

 }