body{
    background-color: palegoldenrod;
    margin: 15px;
    padding: 15px;
border: 1px solid black;
 }

html{
    background-color:floralwhite;
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
}
section{
    background-color: rgb(205, 241, 136);
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
    display: flex;
    text-align: center;
}
article, aside {
    background-color: rgba(240, 180, 72,);
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
    text-align: center;
}
h2, p, img, audio, video, iframe {
    background-color: rgb(251, 211, 151);
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
}
header{
    background-color: rgb(151, 149, 41);
    font-size: 50px;
}
.file {
    background-color: #ff0;
    flex-wrap: wrap;

}

.flex-container{
    margin: 10px;
    display: flex;
    flex-wrap: wrap;
    background-color: #00f;
  }
  
.flex-container > div {
    background-color: #f1f1f1;
    width: 100px;
    margin: 10px;
    text-align: center;
    line-height: 75px;
    font-size: 30px;
}

.flex-container {
    display: none;
}
h2, p, img, audio, video, iframe {
    background-color: #ff9;
    padding: 10px;
    margin: 10px;
    border: 1px solid black;
}