* {
    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: 4px 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-flow: row wrap; /* flex-direction, flex-wrap */
  justify-content: space-evenly;
}

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

.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;
    min-width: 100px; aspect-ratio: 1;
    max-height: 100px;
    align-self: center; /* vertical center */
}

.demo8 .flex-parent {
border: 4px solid red;
flex-flow: row wrap;
justify-content: center;
gap: 0px;
}

.dem8 .flex-child {
flex-basis: 25%;
margin: 0;
flex-grow: 1;
}