/* add your CSS below */
main, header, footer {
    width: 700px;
    margin-left: auto;
    margin-right: auto;
    outline: 1px solid red;
}
body {
    font-family: sans-serif;
    font-size: 18px;
    background-color: #6d6def;
}
h1 {
    text-align: center;
    margin-top: 30px;
    color: #76a0e0;
    font-size: 50px;
    font-family: Garamond, serif;
    border: 5px dashed white;
}
h2 { 
    font-size: 2em; 
    color: rgb(166, 220, 99); 
    margin-top: 0; 
    font-family: Garamond, serif; 
}
section {
    background-color: #d85656;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 20px;
    box-shadow: 4px 4px 10px rgba(161, 17, 17, 0.2); /* Horizontal, Vertical, Blur, Spread, Color */
}
ul { 
    ???????????? 
    width: 60%; 
} 
 
li { 
    margin-bottom: 20px; 
    line-height: 1.5em; 
} 
main a:visited {background-color: yellow;}
main a:hover {background-color: red;}

footer a {color: #6d6def;}
.colours { 
    background-image: url('../images/paint.jpg'); 
    background-size: cover; 
} 
 
.references { 
    background-image: url('../images/glasses.jpg'); 
    background-size: cover; 
} 
 
.cheatsheets { 
    background-image: url('../images/pencils.jpg'); 
    background-size: cover;
}