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

body{
    background-color: #CEC;
    color: #234;
    font-family: verdana;
}

h1 {
    text-align: center;
    margin: 8px 0;
    border-bottom: 2px solid #234;
    padding-bottom: 8px;
}

h2 {
   margin: 8px;
   font-weight: normal;
   background-color: #234;
   color: #CEC;
   padding: 4px; 
}

.flex-parent {
    border: 2px solid transparent;
    min-height: 100px;
    display: flex;
    margin: 8px 8px 40px 8px;
}

.flex-child {
    border: 4px solid green;
    min-height: 80px;
    margin: 8px;
    flex-grow: 1;
    text-align: center;
    font-weight: bold;
}

.demo2 .flex-parent {
    border: 4px solid transparent;
    justify-content: space-around;
}

.demo2 .flex-child {
    border: 4px solid black;
    flex-grow: 0;
    min-width: 16px;
}

.demo3 .flex-parent {
    justify-content: space-between;
    border: 4px solid transparent;
}

.demo3 .flex-child {
    flex-grow: 0;
    min-width: 16px;
    border: 4px solid black;
}

.demo4 .flex-parent {
    justify-content: space-evenly;
    border: 4px solid transparent;
}

.demo4 .flex-child {
    flex-grow: 0;
    min-width: 16px;
    border: 4px solid black;
}

.demo5 .flex-parent, .demo6 .flex-parent{
    border: 4px solid transparent;
}

.demo5 .flex-parent {
    flex-direction: row-reverse;
}

.demo5 .flex-child:last-child {
    background-color: yellow;
}

.demo6 .flex-parent {
    display: flex;
    flex-wrap: wrap; 
    justify-content: space-evenly;
}

.demo6 .flex-child {
    background-color: pink;
    min-width: 200px;
    flex-grow: 1; /* flex-grow: 0 will set children to smallest width */
}

.demo7 .flex-parent {
    border: 4px solid transparent;
    min-height: 200px;
    justify-content: center; /* horizontal center */
}

.demo7 .flex-child {
    flex-grow: 0;
}

.demo7 .flex-child:last-child {
    background-color: yellow;
    max-height: 100px; aspect-ratio: 1;
    min-width: 100px;
    align-self: center; /* vertical center */
}

.demo8 .flex-parent {
    border: 4px solid red;
    flex-flow: row wrap; /* <-- combination of flex-direction and flex-wrap */
    justify-content: center;
    gap: 10px; 
}

.demo8 .flex-child {
    flex-basis: 25%;
    margin: 0;
    flex-grow: 1;
}

nav { 
    text-align: center;
    width: 100%;
    padding-bottom: 2px;
    word-wrap: break-word;
    align-self: center;
    position: relative;
    font-weight: bold;
   }