@media (max-width: 768px){

    header h2, header h4{ font-size: 7.5vw}
    header h1, header h3{ font-size: 4.5vw; }

    header{
        width: 80vw;
    }
    
    header h1{
        margin: 50% 0 5px 0%;
    }
    
    header h2{
        margin: 0 0 100px 0%;
        line-height: 1.5;
        
    }

    header h3,
    header h4{
        margin: 0;
        line-height: 1.5;
    }

}