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

body {
    background-color: paleturquoise;
    color: #234;
    font-family:Verdana, Geneva, Tahoma, sans-serif;
}

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: 4px solid transparent;
    min-height: 100px;
    display:flex;
    margin:8px 8px 40px 8px;
}

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

.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-flow: row wrap;
    justify-content: space-evenly;
}

.demo6 .flex-child {
    background-color:teal;
    min-width: 200px;
    flex-grow:1;
}

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

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

}

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

.demo8 .flex-parent {
    border: 4px solid red;
    flex-flow:row wrap;
    justify-content: center;
    gap:10px;
}

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