#overlay-content{
    position: absolute; 
    display: none; 
    width: 100%; 
    height: 100%; 
    top: 0; 
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1; 
}

#overlay-background {
    width: 100%; 
    height: 100%; 
    top: 0; 
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5); 
    z-index: 1; 
    cursor: pointer;
    position: fixed;
  }

  #overlay-frame{
      max-width: 450px;
      width: 100%;
      height: auto;
      background-color: white;
      border-radius: 10px;
      margin: 20px auto;
      padding: 15px;
      position: relative;
      text-align: center;
      z-index: 3; 
  }

  .overlay-nadpis{
      font-size: 2em;
      line-height: normal;
  }

  .close-button{
      top: 0;
      right: 0;
      position: absolute;
      font-size: 1.5em;
      display: block;
      padding: 10px;
      color: lightgray;
      cursor: pointer; 
  }