/* css reset rule */
* {
    margin: 0; padding: 0;
}

/* type selector */

body {
    background-color: #234;
    color: #eee;
    font-family: verdana, arial, sans-serif;
    border: 4px solid #222;
    margin: 4px;
    padding: 12px;
}

header {
    background-color: #222;
    padding: 12px;
    text-align: center;
}

/* child selector */

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

/* decendent selector */

header span {
    display: block;
    border: 0px;
    color: #ff4;

}

/* class selector */

.subtitle {
    text-align: center;
    /* border: 2px solid #222; */
    padding: 10px;
    line-height: 1.5;
    text-transform: lowercase;
    letter-spacing: 8px;
}

/* adjacent selector */

header + p {
    display: none;
}

/* CSS ruleset, aka rule slection {
declaration1;
declaration2;
property: value;
property: value;
property: value1, value2, value3;
property: value value;
}
    */

/* ======================= */
/* CSS Examples */

section {
    display: flex;
    justify-content: center;
    flex-flow: row wrap;
    margin-bottom: 800px;
}

section article {
    border: 2px solid hotpink;
    max-width: 360px;
    min-height: 200px;
    margin: 10px;
    flex: 0 0 auto;
    padding: 4px;
}

article h2 {
    font-size: 16pt;
}

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

/* id selector */

#art1 div{
    width: 70%;
    aspect-ratio: 2/1;
    background-color: skyblue;
    margin: 20px auto;
    border-radius: 20px;
}

#art2 div {
    width: 70%;
    aspect-ratio: 2.5/1;
    background-color: #000;
    /* center block */
    margin: 20px auto;
    border-radius: 20px;
    box-shadow: 4px 8px 10px white;
}

#art3 h2 {
    font-family: "Bytesized", sans-serif;
    text-align: center;
    font-size: 18pt;
    color: #ff3;
    border: 2px solid yellowgreen;
}

#art4 {
    /* use position relative on the parent */
    position: relative;
}

#art4 h2 {
    color: #ff3;
    /* use position absolute on the child you want to manipulate */
    position: absolute;
    bottom: 10; right: 0;
    border: 2px solid yellowgreen;
    width: 100%;
    text-align: center;
    /* padding-bottom: 10px; */
}

#art5 {
    position: relative;
}

#art5 div {
    /*setting position absolute to ALL divs within art5 */
    position: absolute;
}
#art5 div:nth-of-type(1) {
    width: 40%; aspect-ratio: 1/1;
    background-color: #f44;
    bottom: 4px; left: 64px;
    z-index: 10;
}

#art5 div:nth-of-type(2) {
    width: 40%; aspect-ratio: 1/1;
    background-color: #44f;
    bottom: -10; right: 64px;
    z-index: 5;
}

#art6 {
    transition: all 300ms linear;

}
/* pseudo element */
#art6:hover {
    background-color: #404;
    color: #ff4;
    border: 2px solid yellowgreen;
}