:root {
  --mavi: #00c8ff;
  --gri: #1a1a1a;
  --siyah: #0e0e0e;
  --beyaz: #ffffff;
  --vurgulu: #00f0ff;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

html {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  background-color: var(--siyah);
  color: white;
  flex-direction: column;
  align-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

header {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  width: 100%;
  align-items: center;
  flex-wrap: wrap;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

main > * {
  display: flex;
  justify-content: center;
}

header img {
  width: 220px; 
}

@media (min-width: 768px) {
  header img {
    width: 350px;
  }
}


main img {
  margin: 25px 0px;
  width: 100%; 
  border: 1px solid var(--mavi);
  border-radius: 8px;
  box-shadow: 0 0 10px var(--mavi);
}

@media (min-width: 908px) {
  main img {
    width: 35%;
  }
}