* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {

    font-family: 'Times New Roman', Times, serif;
}

#header {
    background-color: rgb(11, 47, 82);
    grid-area: hea;
    padding: 30px;
    text-align: center;
    color: white;
    font-size: 1.4rem;
}

#nav {
    
    background-color: rgb(4, 150, 150);
    grid-area: menu;
    padding: 20px;
    font-size: 1.7rem;
   
    
}
#nav a {
    text-align: center;
    display: block;
    padding: 14px 16px;
    text-decoration: none;
     
}



#nav ul {
    list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  
    
      
}


#nav li {
    float: left;
    
   
    
    
   
   
}
figure {
    border: 1px solid gray;
    min-height: 50px;
    
    
}
figcaption {
    padding: 10px;
    background-color: rgb(4, 150, 150) ;
    
}

#main {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-areas:
        'hea hea hea hea'
        'menu menu menu menu'
        'obr1 obr2 obr3 obr4';
        gap: 10px;
    
}

#pr {
    grid-area: obr1;
}
#dr {
    grid-area: obr2;
}
#tr {
    grid-area: obr3;
}
#ct {
    grid-area: obr4;
}

img {
    width: 100%;
    border: 1px solid white;
}

figcaption {
    text-align: center;
    font-size: 1.3rem;
    color: white;
    
}
#nav a:hover {
    border: 1px yellowgreen solid;
    border-radius: 18px;
    background-color: yellowgreen;
    padding: 10px;
}
#nav::after {
    content: "";
    display: table;
    clear: both;
}
#nav a {
    color: white;
    text-decoration:  none;
    
     
}

@media screen and (max-width: 600px) {
    #header {grid-area: 1 /span 4;}
    #nav {grid-area: 2 /span 4;}
    #pr {grid-area: 3 /span 4;}
    #dr {grid-area: 4 /span 4;}
    #tr {grid-area: 5 /span 4;}
    #ct {grid-area: 6 /span 4;}
    #nav li {float: none;}
}

#pr, #dr, #tr, #ct {
    text-decoration: none;
}

 figcaption:hover {
    background-color: yellowgreen;
 }