* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
}

main h1,
main h2,
main p {
  color: #fff;
}

.bolum1 {
  min-height: 100vh;
  margin-top: 0;
  background-image: url('image/index.jpg');
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.7);
}

.kutucuk1 {
  background-color: rgba(0, 0, 0, 0.6);
  width: 90%;
  margin: 50px 0;
  border-radius: 20px;
  text-align: center;
  color: white;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
  padding: 20px;
}

@media (max-width: 768px) {
  main h1 { font-size: 22px; }
  main h2 { font-size: 18px; }
  main p  { font-size: 16px; }
  .kutucuk1 {
    width: 96%;
    margin: 30px 0;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  main h1 { font-size: 28px; }
  main h2 { font-size: 22px; }
  main p  { font-size: 18px; }
}

@media (min-width: 1025px) and (max-width: 1280px) {
  main h1 { font-size: 32px; }
  main h2 { font-size: 24px; }
  main p  { font-size: 18px; }
}

@media (min-width: 1281px) {
  main h1 { font-size: 36px; }
  main h2 { font-size: 28px; }
  main p  { font-size: 20px; }
}