*{
    box-sizing:border-box;
}

body{
    background-image:url("dsgn_23.jpg");
    background-position: center;
    background-size: cover;
    height: 100%;
    font-family: 'Oswald', sans-serif;
    color:white;
    font-size: 20px;
}

.flex-container {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-around;
    padding: 7px;
    margin: 0;
    list-style: none;
  }
  
  .flex-item {
    background: goldenrod;
    padding: 5px;
    width:180px;
    height:80px;
    margin-top: 10px;
    line-height: 80px;
    color: white;
    font-weight: bold;
    font-size: 3em;
    text-align: center;
  }

  .flex-item.active {
      background: black;
      animation:animate 3.5s;

  }    

  @keyframes animate{
    0%{
      opacity: 0;
    }
    50%{
      opacity: 0.7;
    }
    100%{
      opacity: 1;
    }
  }

  .button{
    background-color: darkblue;
    font-size: 20px;
    border-color: none;
    color: white;
    padding: 15px 32px;
    margin-left: 10px;
  }
  .button:hover {
    background-color: #ff0000;
    color: white;
  }

  #layerbackground { 
    background-image: linear-gradient(red, maroon);
    opacity: 0.9;
    color: white;
  }