.box{
  width: 300px;
  padding: 40px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  background: #191919;
  text-align: center;
}
.box h1{
  color: white;
  text-transform: uppercase;
  font-weight: 500;
}
.box input[type = "text"],.box input[type = "password"]{
  border:0;
  background: none;
  display: block;
  margin: 20px auto;
  text-align: center;
  border: 2px solid #3498db;
  padding: 14px 10px;
  width: 200px;
  outline: none;
  color: white;
  border-radius: 24px;
  transition: 0.25s;
}
.box input[type = "text"]:focus,.box input[type = "password"]:focus{
  width: 280px;
  border-color: #2ecc71;
}
.box input[type = "submit"]{
  border:0;
  background: none;
  display: block;
  margin: 20px auto;
  text-align: center;
  border: 2px solid #2ecc71;
  padding: 14px 40px;
  outline: none;
  color: white;
  border-radius: 24px;
  transition: 0.25s;
  cursor: pointer;
}
.box input[type = "submit"]:hover{
  background: #2ecc71;
}







body {
  margin: 0;
  padding: 0;
  
}



model-viewer{

  --poster-color: transparent; 
  

}

model-viewer#reveal {
  --poster-color: transparent;

}


model-viewer {
  width: 100%;
  height: 100%;
  
}

.modelViewer.poster {
  width: 100%;
  height: 100%;

}

.ar-button{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     right: 0px;
     top: 0px;
     margin: 2.6em;
     
 }

.grid-container{
  background-color: #fff;
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-gap: 0px;
}

.controls{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     left: 0px;
     bottom: 0px;
     margin: 2em;




}
  
            


.premluxlogo{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     left: 0px;
     top: 0px;
     margin: 2em;
  

 
}

  
            

.pimaklogo{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     left: 0px;
     top: 0px;
     margin: 2em;
  

 
}


.huxellogo{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     left: 0px;
     top: 0px;
     margin: 2em;
  

 
}






  
            

.myDiv{
  display: inline-block;
  color: rgb(0, 0, 0);
  position: absolute;
  

     left: 0px;
     bottom: 0px;
     margin: 2em;
  

 
}




.a {
  grid-column: 1 / 5;
  grid-row: 1 / 7;
}





@media (max-width:629px) {
img#optionalstuff {
 display: none; }
} 




@media (max-width: 880px) { 
  .a {
    grid-column: 1 / 8;
    grid-row: 1 / 7;
  }
  .b {
    grid-column: 8 / 13;
    grid-row: 1 / 4;
  }
  .c {
    grid-column: 8 / 13;
    grid-row: 4 / 7;
  }


}


@media (max-width: 480px) {
  .a {
    grid-column: 1 / 5;
    grid-row: 1 / 5;
  }
  .b {
    grid-column: 1 / 7;
    grid-row: 5 / 7;
  }
  .c {
    grid-column: 7 / 13;
    grid-row: 5 / 7;
  }

  .pimaklogo {
    max-height: 50px;
    max-width: 90px;


     }

    

}




<!--MODAL AYARLARI-->

*{
     margin: 0em;
     padding: 0em;
     box-sizing: border-box;
    }
  
    body{
     font-family: sans-serif;
    }
  
    a:link,
    a:visited{
     text-decoration: none;
    }
    
    .modal{
   background-color: rgba(0, 0, 0, 0.589);
   width:100%;
   height: 100%;
   position: absolute;
   top: 0;
   left: 0;
   z-index: 10;
   opacity: 0;
   visibility: hidden;
   transition: all .5s;
   padding: 0em;
  }
  
  
    .modal__content{
     width: 100%;
     height: 100%;
     background-color: rgba(0, 0, 0, 0.842);
     position: absolute;
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
     padding: 0em;
     border-radius: 0em;
     opacity: 0;
     visibility: hidden;
     transition: all .5s;
     
    }
  
    #modal:target{
     opacity: 1;
     visibility: visible;
    }
  
    #modal:target .modal__content{
     opacity: 1;
     visibility: visible;
    }
  
    .modal__close{
     color: #ffffff;
     font-size: 4em;
     position: absolute;
     top: .4em;
     right: 0.7em;
    }
  
    .modal__heading{
     color: rgb(255, 255, 255);
     margin-bottom: 1em;
  
    }
  
    
    .modal__paragraph{
     line-height: 2em;
     color: rgb(255, 255, 255);
     margin: 2em;
    }

    .ariconbeyaz{
  
     margin-top: 7em ;
     
    }

.lambaqr{
  
     margin-top: 7em ;
     
    }

    .huxellogobeyaz{
  
      margin-top: 7em ;
      
     }
  

  .modal-open{
   display: inline-block;
   color: rgb(0, 0, 0);
   position: absolute;
   

      right: 0px;
      top: 0px;
      margin: 1.8em;
      
      
  }
  .modal-open2{
    display: inline-block;
    color: rgb(0, 0, 0);
    position: absolute;
    
 
       left: 0px;
       bottom: 0px;
       margin: 1.8em;
       
       
   }
  

  









   .modal2{
    background-color: rgba(0, 0, 0, 0.589);
    width:100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transition: all .5s;
    padding: 0em;
   }
   
   
     .modal__content2{
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.842);
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      padding: 0em;
      border-radius: 0em;
      opacity: 0;
      visibility: hidden;
      transition: all .5s;
      
     }
   
     #modal2:target{
      opacity: 1;
      visibility: visible;
     }
   
     #modal2:target .modal__content2{
      opacity: 1;
      visibility: visible;
     }
   
     .modal__close2{
      color: #ffffff;
      font-size: 4em;
      position: absolute;
      top: .4em;
      right: 0.7em;
     }
   
     .modal__heading2{
      color: rgb(255, 255, 255);
      margin-bottom: 1em;
   
     }
   
     
     .modal__paragraph2{
      line-height: 2em;
      color: rgb(255, 255, 255);
      margin: 2em;
     }
 
     .ariconbeyaz{
   
      margin-top: 2em ;
      
     }