html {
    background-color:rgb(25, 171, 93) ;
    padding: 10px;
    margin: 10px;
    border: 4px solid black;
}

body {
    background-color:rgb(86, 199, 49) ;
    padding: 10px;
    margin: 10px;
    border: 3px solid black;
}

section {
background-color: rgb(38, 184, 47);
padding: 5px;
margin: 4px;
border:2px solid black;
display: flex;
text-align: center;
}

article, aside {
    background-color:rgb(17, 58, 4) ;
    padding: 10px;
    margin: 10px;
    border: 3px solid black;
    text-align: center;
}

h2, p, img, audio, video, iframe {
    background-color: rgb(173, 255, 153);
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
}

img, audio, video, iframe {
    width: 500px;
}

#contact {
    background-color: green 
    display: block;
    text-align: center;
}

.file {
    background-color: rgb(51, 255, 0);
}

.flex-container {
    margin: 10px;
    display: flex;
    flex-wrap: wrap;
    background-color: rgb(0, 255, 8);
  }
  
.flex-container > div {
    background-color: #f1f1f1;
    width: 100px;
    margin: 10px;
    text-align: center;
    line-height: 75px;
    font-size: 30px;
}

.flex-container {
    display: none;
}