header, footer {
 background-color: lightgreen;
color:black;
text-align: center; 
 } 
 nav { 
background-color:gray; 
justify-content: center; 
}
 nav a {
text-decoration:none; 
 color: black;
 font-weight: bold; 
 } 
  main { 
display: flex;
} 
strong {
 color: rgb(13, 82, 44);
 } 
 article {
 background-color: rgb(165, 231, 216);
 padding: 1rem;
 border-radius: 10px;
 margin-bottom: 1rem;
 } 
aside {
 background-color: white;
 }
 img {
 max-width: 100%;
 margin-top: 1rem;
 border: 4px solid #f44336;
 border-radius: 8px;
 } 
 footer a {
 color: rgb(0, 0, 0);
 text-decoration: none;
 }