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

body {
    background-color: purple; color: gold;
    font-family: verdana, arial, sans-serif;
    padding: 12px;
    padding-bottom: 800p;
    margin: 4px;
    border: 4px solid peachpuff;
}

header {
    border: 5px solid gold;
    padding: 12px;
text-align: center;
}

/* decendent selector */

header > h1 {
    text-align: center;
    font-weight: normal;
    text-transform: uppercase;
    color: lime;
    padding-bottom: 20px;
    margin-bottom: 20px;
    border-bottom: 2px solid peachpuff
}

/* child selector */
 
header span {
    display: block;
    border: 0px;
    color: skyblue;
}


/*class selector */

.subtitle{
text-align: center;
border: 1px solid peachpuff;
padding: 10px;
line-height: 1.5;


}




section {
    display: flex;
    justify-content: center;
    flex-flow:row wrap;
    border: 2px solid goldenrod
}

section article {
    border: 2px solid yellow;
    max-width: 360px;
    min-width: 200px;
    min-height: 200px;
    margin:10x;
    flex: 0 0
}

article h2 {
font-size: 16pt;
}

article p {
    margin:  8px;
    line-height: 1.4;
}

#art div {

    width: 70%;
    aspect-ratio: 2/1;
    background-color: blue;
    margin: 20px auto;
    border-radius: 20px;
}