* {
    margin: 0px;
    padding: 0px    ;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
background-color: rgb(185, 185, 185);


}


#a {
    color: white;
background: gray;
padding: 10px  20px;
margin: 20px;

}

#f {
    color: white;
}

table {
width:90% ;
border-collapse: collapse;
margin:70px ;

}

td {
border: 1px solid black;
padding: 10px;
text-align: center;
width:50px ;
height: 250px;
}

img {
width: 130px;
height:auto ;

}