.nav_image{
    width:100%;
    height:20%;
    box-sizing: border-box;
    overflow:hidden;

}

.nav_image img{
    width:100%;
    height:auto;
}

.project_image{
    width:100%;
    height:50%;
    overflow:hidden;
    box-sizing: border-box;
    overflow: hidden;
}

.project_image img{
    width:100%;
    height:auto;
    

}