body{
        margin: 0;
        color: white;
        background-image: url(../img/blacksea.jpg);
        background-size: cover;
        font-family: "Times New Roman", Times, serif;
      }
      nav{
        margin: 0 auto;
        width: 100%;
        display: flex;
        justify-content: space-evenly;
      }
      a{
        color: gray;
      }
      a:hover{
        color: blue;
      }
      footer{
        text-align: center;
        text-shadow: 1px 1px 0 black;
      }
      .banner{
        width: 100%;
        overflow: hidden;
        margin: 0 auto;
        max-width: 44em;
        border: black ridge 5px;
      }
      .contenedor{
        background-color: rgba(0,0,0,0.8);
        padding: 1em;
        margin: 0 auto 1em;
        max-width: 63em;
        border: black ridge 5px;
      }
      .window{
        margin: 1em;
        display: inline-block;
        border: white ridge;
        border-width: 6px 3px;
      }