body{background-color: rgba(151, 151, 151, 0.74);
    margin:0px;
    padding:0px;
}

header{
    background-color: beige;
    height: 8vh;
}
nav{
    background-color: rgb(78, 78, 78);
    height: 10vh;
}
main{
    background-color: rgb(253, 253, 253);
    height: 75vh;
}
footer{
    background-color: rgb(186, 203, 204)171, 172);
    height: 7vh;
}
@media(min-width:481px){
   .kontajner{
    display:flex;
    width: 100vw;
    flex-direction:row
   }
    nav{height: 85vh;
width: 100vw;
box-sizing:border-box;
    }
    main{height: 85vh;
box-sizing: border-box;
flex-grow: 1;
    }
}