section.sec1{
    background-image: url(images/Csoon.jpg);
    width: 100%;
    height: 100vh;
    background-repeat: no-repeat;
}

@media only screen and (max-width:360px) { 
section.sec1{
    background-image: url(images/Gfig.jpg);
    width: 100%px;
    height: 100vh;   
} 
} 
@media only screen and (max-width:414px) {
section.sec1{
    background-image: url(images/Gfii.jpg);
    width: 100%;
    height: 100vh;
           
    } 
}