body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
}

.background-image {
    background-image: url('image/BD.jpg'); 
    background-size: cover;  
    background-position: center;
    background-repeat: no-repeat;
    height: 100vh; 
    width: 100vw;   
}
.full-image {
    display: block;   
    width: 100%;      
    height: auto;     
}