*{padding: 0; margin: 0;}
.arkaplan{
  width: 100%;
  height: 100vh;
  background: linear-gradient(to top, #161c23, transparent 100%), linear-gradient(#161c23, transparent 100%), #161c23 url('https://source.unsplash.com/category/technology/1500x2000') no-repeat center;
}

#nesbil_aciklama { 
  width: 602px;
  height: 103px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -301px;
  margin-top: -52px; 
  text-align: center;
  color: #fff;
}


#nesbil_logo { 
  width: 302px;
  height: 75px;
  position: absolute;
  left: 50%;
  bottom: 2%;
  margin-left: -151px;
  margin-bottom: -10px; 
}