html,body {

    font-family: Arial, Helvetica, sans-serif;
    margin:0;
}

header {

    background-color:yellowgreen;
   padding:50px;
    text-align: center;
            
}
   

 h1 {
font-size: 60px;
color:black;


}

header img {

    border-radius: 174px;
    width: 300px;
    border: 16px solid green;
}

.content {

    max-width: 900px;
    margin: 0 20px;
    padding:0 20px;

}


img.big-image {
    max-width:100%;
 

}

p.caption {

    font-size: 16px;
    color:gray;
    font-style: italic;
}

ul {
list-style: none;
padding: 0;
margin: 0;
    
}

a {

    color:red;
    text-decoration: none;

}

a:hover {
    color:blue;
}


footer {

margin-top:20px;
padding:40px 20px;
background-color: rgb(10, 36, 20);
 
}

footer ul {
    text-align: center;

}

footer ul li {

    display:inline-block;
    margin:0 5px; 
    color:white;
}