* {
    margin: 0;  /*  m:0  */
    padding: 0;  /*  p:0  */
    border: 0;  /*  bd:0  */
    box-sizing: border-box;  /*  bxz  */
}

html {
    min-height: 100vh;
}

body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-color: powderblue;
    height: 100vh;
}

#container {
    width: 85%;
    background-color: hsla(100, 100%, 40%, 1);
    min-height: 85%;
    margin: 16px auto;
}

header {
    background-color: hsla(200, 100%, 40%, .6);
    height: 160px;
}

#container > div {
    background-color: hsla(100, 100%, 40%, 1);
}

#container > div > nav {
    background-color: hsla(100, 100%, 40%, 1);
    height: 500px;
    width: 200px;
    float: left; /* place on the left and the following content will slide up on the right */
}

div > main {
    background-color: hsla(20, 100%, 40%, .6);
    min-height: 900px;
    padding-bottom: 80px;
    margin-left: 200px;
}

footer {
    background-color: hsla(240, 100%, 40%, .2);
    height: 140px;
}

article {
    border-color: hsla(200, 100%, 100%, .7);
    border-width: 4px;
    border-style: groove;
    margin: 80px 8px 8px 8px;
    position: relative;
    min-height: 100px;
}

article > h3 {
    position: absolute;
    top: -36px; left: 0;
}

article > div {
    width: 120px; height: 120px;
    border: 8px solid #222;
    margin: 8px;
}

article#example1 {
    display: flex; /* make a flex parent */
}

article#example2 {
    display: flex;
    justify-content: flex-end;
}

article#example3 {
    display: flex;
    justify-content: center;
}

article#example4 {
    display: flex;
    justify-content: space-around;
}

article#example5 {
    display: flex;
    flex-flow: row wrap;
}article#example5 {
    display: flex;
    flex-flow: row wrap;
}

article#example6,
article#example7,
article#example8 {
    display: flex;
    flex-flow: row wrap;
}

#example6 div:nth-of-type(1) {
    flex: 1 0 auto;
}
 #example6 div:nth-of-type(2) {
    flex: 1 0 auto;
}

#example6 div:nth-of-type(3) {
    border: 8px solid yellowgreen;
    flex: 4 0 auto;
    /* flex-grow: 1; */
    /* flex-shrink: 0; */
    /* flex-basis: auto; */
}

#example7 div:nth-of-type(2) {
    border: 8px solid orange;
    flex: 1 0 auto;
}

#example8 div:nth-of-type(1) {
    border: 0px solid orange;
    background-color: orange;
    flex: 1 0 50%;
}
#example8 div:nth-of-type(2) {
    border: 0px solid yellowgreen;
    background-color: yellowgreen;
    flex: 1 0 50%;
}
#example8 div:nth-of-type(3) {
    border: 0px solid skyblue;
    background-color: skyblue;
    flex: 1 0 50%;
}