@media screen and (max-width: 600px) {
    #main{
        height:100%;
        width:100%;
    }
    nav{
        width:100%;
    }
    h1{
        font-size: 7.5vw;
    }
    /* ul{
       left:60vw;
    } */
    li a{
        display :none;
        font-size: 6vw;
    }
    #first_icon{
        display:block;
        
        position: relative; 
    }
    #second_icon{
        /* display:block; */
        position: relative;
    }
}