@media (min-width: 600px) {
      body {
             background-color: #00a7d0;
         }
     }
     @media (max-width: 599px) {
     body {
        background-color: white;
       }
     }

    #container {
        display: flex;
        flex-wrap: wrap;
        align: center;
        }
    #container > div {
        background-color: lightgray;
        font-size: 20px;
        margin: 20px;
        padding: 20px;
        width: 200px;
        text-align: center;
}