@media screen and (max-width: 730px) {
    .navbar{
        padding: .5rem 0;
    }
    .mobile_text_center{
        text-align: center;
        width: 100%;        
    }
    .mobile_flex_center{
        display: flex;
        justify-content: center;
        align-items: center;        
        width: 100%;        
    }
    .app_img{
        width: 70%;
    }
    .invite_friends_img{
        height: auto;
    }
}