@media screen and (max-width:1800px) {
    
    .textimg button{
        margin-top: 40px;
    }
    .textimg h1{
        margin-top: 20px;
    }
    
}
@media screen and (max-width:1300px) {
    nav ul {
        margin-left: 40vw;
        margin-top: 25px;
        display: flex;
        
    }
    .vision{
        margin-top: -150px;
    }
    .textimg button{
        margin-top: 40px;
    }
    .textimg h1{
        margin-top: 20px;
    }
    .item{
        height: 450px;
        width: 350px;
    }
}
@media screen and (max-width:1000px) {
    nav ul {
        margin-left: 30vw;
        margin-top: 25px;
        display: flex;
        
    }
    .vision{
        margin-top: -200px;
    }
    .textimg h1{
        margin-top: 20px;
    }
    .item{
        height: 550px;
    }
    .item{
        margin-left: 30px;
        width: 300px;
    line-height: 20px;
        height: 400px;
    }
}
@media screen and (max-width:800px) {
    
    .arpanimg img{
        width: 200px;
    }
    .vision{
        margin-top: -250px;
    }
    .textimg h1{
        margin-top: 20px;
        margin-left: -20px;
    }
    .textimg button{
      
        margin-left: 70px;
    }
   
}