body, html
 { 
  margin:3px;
  padding:0px;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  background-color: YELLOW;
 }
       #container {
                display: flex;
                flex-wrap: wrap;
                text-align: center;
                justify-content: space-around;
            }

            #container > div {
                background-color: #c2cded;
                font-size: 20px;
                margin: 20px;
                padding: 20px;
                width: 250px;
                text-align: center;
            }